21204012532 has 12 divisors (see below), whose sum is σ = 37136504160. Its totient is φ = 10593582776.

The previous prime is 21204012523. The next prime is 21204012607. The reversal of 21204012532 is 23521040212.

It is a happy number.

It is a super-2 number, since 2×21204012532² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100208 + ... + 2110279.

It is an arithmetic number, because the mean of its divisors is an integer number (3094708680).

Almost surely, 2^21204012532 is an apocalyptic number.

It is an amenable number.

21204012532 is a deficient number, since it is larger than the sum of its proper divisors (15932491628).

21204012532 is a wasteful number, since it uses less digits than its factorization.

21204012532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211750 (or 4211748 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21204012532 its reverse (23521040212), we get a palindrome (44725052744).

The spelling of 21204012532 in words is "twenty-one billion, two hundred four million, twelve thousand, five hundred thirty-two".