21123504520252 has 12 divisors (see below), whose sum is σ = 37030199002720. Its totient is φ = 10543447662336.

The previous prime is 21123504520249. The next prime is 21123504520301. The reversal of 21123504520252 is 25202540532112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4576146852 + ... + 4576151467.

Almost surely, 2^{21123504520252} is an apocalyptic number.

It is an amenable number.

21123504520252 is a deficient number, since it is larger than the sum of its proper divisors (15906694482468).

21123504520252 is a wasteful number, since it uses less digits than its factorization.

21123504520252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9152298900 (or 9152298898 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21123504520252 in words is "twenty-one trillion, one hundred twenty-three billion, five hundred four million, five hundred twenty thousand, two hundred fifty-two".