21061023052 has 18 divisors (see below), whose sum is σ = 37105967948. Its totient is φ = 10459792848.

The previous prime is 21061023047. The next prime is 21061023073. The reversal of 21061023052 is 25032016012.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 29778 + ... + 207385.

Almost surely, 2^21061023052 is an apocalyptic number.

It is an amenable number.

21061023052 is a deficient number, since it is larger than the sum of its proper divisors (16044944896).

21061023052 is a wasteful number, since it uses less digits than its factorization.

21061023052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237465 (or 237314 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21061023052 its reverse (25032016012), we get a palindrome (46093039064).

The spelling of 21061023052 in words is "twenty-one billion, sixty-one million, twenty-three thousand, fifty-two".