1612013021 has 2 divisors, whose sum is σ = 1612013022. Its totient is φ = 1612013020.

The previous prime is 1612013017. The next prime is 1612013041. The reversal of 1612013021 is 1203102161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1463904121 + 148108900 = 38261^2 + 12170^2 .

It is an emirp because it is prime and its reverse (1203102161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1612013021 - 2² = 1612013017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1612013041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806006510 + 806006511.

It is an arithmetic number, because the mean of its divisors is an integer number (806006511).

Almost surely, 2^1612013021 is an apocalyptic number.

It is an amenable number.

1612013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612013021 is an equidigital number, since it uses as much as digits as its factorization.

1612013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1612013021 is about 40149.8819549946. The cubic root of 1612013021 is about 1172.5269903150.

Adding to 1612013021 its reverse (1203102161), we get a palindrome (2815115182).

The spelling of 1612013021 in words is "one billion, six hundred twelve million, thirteen thousand, twenty-one".