21142012400 has 60 divisors (see below), whose sum is σ = 52432221504. Its totient is φ = 8184000000.

The previous prime is 21142012363. The next prime is 21142012517. The reversal of 21142012400 is 421024112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840101 + ... + 864900.

Almost surely, 2^21142012400 is an apocalyptic number.

21142012400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21142012400 is an abundant number, since it is smaller than the sum of its proper divisors (31290209104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142012400 is a wasteful number, since it uses less digits than its factorization.

21142012400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705050 (or 1705039 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21142012400 its reverse (421024112), we get a palindrome (21563036512).

The spelling of 21142012400 in words is "twenty-one billion, one hundred forty-two million, twelve thousand, four hundred".