21052970629 has 4 divisors (see below), whose sum is σ = 22291380684. Its totient is φ = 19814560576.

The previous prime is 21052970611. The next prime is 21052970639. The reversal of 21052970629 is 92607925012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19373856100 + 1679114529 = 139190^2 + 40977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21052970629 - 2⁵ = 21052970597 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 (21052970639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619205002 + ... + 619205035.

It is an arithmetic number, because the mean of its divisors is an integer number (5572845171).

Almost surely, 2^21052970629 is an apocalyptic number.

It is an amenable number.

21052970629 is a deficient number, since it is larger than the sum of its proper divisors (1238410055).

21052970629 is a wasteful number, since it uses less digits than its factorization.

21052970629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238410054.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 21052970629 in words is "twenty-one billion, fifty-two million, nine hundred seventy thousand, six hundred twenty-nine".