29420306921 has 2 divisors, whose sum is σ = 29420306922. Its totient is φ = 29420306920.

The previous prime is 29420306899. The next prime is 29420306977. The reversal of 29420306921 is 12960302492.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15816583696 + 13603723225 = 125764^2 + 116635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29420306921 is a prime.

It is not a weakly prime, because it can be changed into another prime (29420306621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14710153460 + 14710153461.

It is an arithmetic number, because the mean of its divisors is an integer number (14710153461).

Almost surely, 2^29420306921 is an apocalyptic number.

It is an amenable number.

29420306921 is a deficient number, since it is larger than the sum of its proper divisors (1).

29420306921 is an equidigital number, since it uses as much as digits as its factorization.

29420306921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 29420306921 in words is "twenty-nine billion, four hundred twenty million, three hundred six thousand, nine hundred twenty-one".