21135750012 has 48 divisors (see below), whose sum is σ = 59011499680. Its totient is φ = 6503307264.

The previous prime is 21135749969. The next prime is 21135750029. The reversal of 21135750012 is 21005753112.

21135750012 is a `hidden beast` number, since 21 + 135 + 7 + 500 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7525573 + ... + 7528380.

Almost surely, 2^21135750012 is an apocalyptic number.

It is an amenable number.

21135750012 is an abundant number, since it is smaller than the sum of its proper divisors (37875749668).

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

21135750012 is a wasteful number, since it uses less digits than its factorization.

21135750012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15053979 (or 15053971 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 21135750012 in words is "twenty-one billion, one hundred thirty-five million, seven hundred fifty thousand, twelve".