21142111400 has 24 divisors (see below), whose sum is σ = 49155409470. Its totient is φ = 8456844480.

The previous prime is 21142111399. The next prime is 21142111423. The reversal of 21142111400 is 411124112.

It can be written as a sum of positive squares in 3 ways, for example, as 19610641444 + 1531469956 = 140038^2 + 39134^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52855079 + ... + 52855478.

Almost surely, 2^21142111400 is an apocalyptic number.

21142111400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21142111400 is an abundant number, since it is smaller than the sum of its proper divisors (28013298070).

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

21142111400 is a wasteful number, since it uses less digits than its factorization.

21142111400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105710573 (or 105710564 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21142111400 its reverse (411124112), we get a palindrome (21553235512).

The spelling of 21142111400 in words is "twenty-one billion, one hundred forty-two million, one hundred eleven thousand, four hundred".