21123742032 has 40 divisors (see below), whose sum is σ = 60632964480. Its totient is φ = 7041247200.

The previous prime is 21123742007. The next prime is 21123742099. The reversal of 21123742032 is 23024732112.

21123742032 is a `hidden beast` number, since 2 + 1 + 1 + 237 + 420 + 3 + 2 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 21123741987 and 21123742005.

It is a congruent number.

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, 24448344 + ... + 24449207.

It is an arithmetic number, because the mean of its divisors is an integer number (1515824112).

Almost surely, 2^21123742032 is an apocalyptic number.

It is an amenable number.

21123742032 is an abundant number, since it is smaller than the sum of its proper divisors (39509222448).

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

21123742032 is a wasteful number, since it uses less digits than its factorization.

21123742032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48897568 (or 48897556 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The spelling of 21123742032 in words is "twenty-one billion, one hundred twenty-three million, seven hundred forty-two thousand, thirty-two".