Search a number
-
+
2021009985 = 325293153281
BaseRepresentation
bin111100001110110…
…0010101001000001
312012211212221111200
41320131202221001
513114334304420
6532313131413
7101040205251
oct17035425101
95184787450
102021009985
11947897795
124849b9b69
132629223c7
141525a7961
15bc662b90
hex78762a41

2021009985 has 24 divisors (see below), whose sum is σ = 3515062824. Its totient is φ = 1074186240.

The previous prime is 2021009983. The next prime is 2021009987. The reversal of 2021009985 is 5899001202.

It is an interprime number because it is at equal distance from previous prime (2021009983) and next prime (2021009987).

It can be written as a sum of positive squares in 4 ways, for example, as 1315948176 + 705061809 = 36276^2 + 26553^2 .

It is not a de Polignac number, because 2021009985 - 21 = 2021009983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021009983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63456 + ... + 89825.

It is an arithmetic number, because the mean of its divisors is an integer number (146460951).

Almost surely, 22021009985 is an apocalyptic number.

It is an amenable number.

2021009985 is a deficient number, since it is larger than the sum of its proper divisors (1494052839).

2021009985 is a wasteful number, since it uses less digits than its factorization.

2021009985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153585 (or 153582 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2021009985 is about 44955.6446400227. The cubic root of 2021009985 is about 1264.3175111085.

The spelling of 2021009985 in words is "two billion, twenty-one million, nine thousand, nine hundred eighty-five".

Divisors: 1 3 5 9 15 45 293 879 1465 2637 4395 13185 153281 459843 766405 1379529 2299215 6897645 44911333 134733999 224556665 404201997 673669995 2021009985