30921342637 has 2 divisors, whose sum is σ = 30921342638. Its totient is φ = 30921342636.

The previous prime is 30921342563. The next prime is 30921342667. The reversal of 30921342637 is 73624312903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30126892041 + 794450596 = 173571^2 + 28186^2 .

It is a cyclic number.

It is not a de Polignac number, because 30921342637 - 2¹¹ = 30921340589 is a prime.

It is a super-2 number, since 2×30921342637² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30921342637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30921342667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15460671318 + 15460671319.

It is an arithmetic number, because the mean of its divisors is an integer number (15460671319).

Almost surely, 2^30921342637 is an apocalyptic number.

It is an amenable number.

30921342637 is a deficient number, since it is larger than the sum of its proper divisors (1).

30921342637 is an equidigital number, since it uses as much as digits as its factorization.

30921342637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 40.

The spelling of 30921342637 in words is "thirty billion, nine hundred twenty-one million, three hundred forty-two thousand, six hundred thirty-seven".