2121550717 has 24 divisors (see below), whose sum is σ = 2659092408. Its totient is φ = 1675576320.

The previous prime is 2121550687. The next prime is 2121550723. The reversal of 2121550717 is 7170551212.

It can be written as a sum of positive squares in 4 ways, for example, as 28579716 + 2092971001 = 5346^2 + 45749^2 .

It is not a de Polignac number, because 2121550717 - 2¹¹ = 2121548669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121550757) 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, 12928 + ... + 66409.

It is an arithmetic number, because the mean of its divisors is an integer number (110795517).

Almost surely, 2^2121550717 is an apocalyptic number.

It is an amenable number.

2121550717 is a deficient number, since it is larger than the sum of its proper divisors (537541691).

2121550717 is a wasteful number, since it uses less digits than its factorization.

2121550717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79389 (or 79378 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 31.

The square root of 2121550717 is about 46060.2943651037. The cubic root of 2121550717 is about 1284.9448046664.

The spelling of 2121550717 in words is "two billion, one hundred twenty-one million, five hundred fifty thousand, seven hundred seventeen".