21134242120 has 32 divisors (see below), whose sum is σ = 48711854520. Its totient is φ = 8247508480.

The previous prime is 21134242097. The next prime is 21134242147. The reversal of 21134242120 is 2124243112.

It can be written as a sum of positive squares in 4 ways, for example, as 18041325124 + 3092916996 = 134318^2 + 55614^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21134242091 and 21134242100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6441727 + ... + 6445006.

Almost surely, 2^21134242120 is an apocalyptic number.

21134242120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134242120 is an abundant number, since it is smaller than the sum of its proper divisors (27577612400).

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

21134242120 is a wasteful number, since it uses less digits than its factorization.

21134242120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12886785 (or 12886781 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21134242120 its reverse (2124243112), we get a palindrome (23258485232).

The spelling of 21134242120 in words is "twenty-one billion, one hundred thirty-four million, two hundred forty-two thousand, one hundred twenty".