1012021001 has 2 divisors, whose sum is σ = 1012021002. Its totient is φ = 1012021000.

The previous prime is 1012020991. The next prime is 1012021019. The reversal of 1012021001 is 1001202101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806844025 + 205176976 = 28405^2 + 14324^2 .

It is an emirp because it is prime and its reverse (1001202101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1012021001 - 2¹⁸ = 1011758857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012021001.

It is not a weakly prime, because it can be changed into another prime (1012021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010500 + 506010501.

It is an arithmetic number, because the mean of its divisors is an integer number (506010501).

Almost surely, 2^1012021001 is an apocalyptic number.

It is an amenable number.

1012021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012021001 is an equidigital number, since it uses as much as digits as its factorization.

1012021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1012021001 is about 31812.2775198507. The cubic root of 1012021001 is about 1003.9910506575.

Adding to 1012021001 its reverse (1001202101), we get a palindrome (2013223102).

It can be divided in two parts, 101202100 and 1, that added together give a palindrome (101202101).

The spelling of 1012021001 in words is "one billion, twelve million, twenty-one thousand, one".