21525504212 has 12 divisors (see below), whose sum is σ = 37675048320. Its totient is φ = 10761204696.

The previous prime is 21525504211. The next prime is 21525504239. The reversal of 21525504212 is 21240552512.

It is a happy number.

It is a super-3 number, since 3×21525504212³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525504211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355268 + ... + 411419.

It is an arithmetic number, because the mean of its divisors is an integer number (3139587360).

Almost surely, 2^21525504212 is an apocalyptic number.

It is an amenable number.

21525504212 is a deficient number, since it is larger than the sum of its proper divisors (16149544108).

21525504212 is a wasteful number, since it uses less digits than its factorization.

21525504212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773710 (or 773708 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21525504212 in words is "twenty-one billion, five hundred twenty-five million, five hundred four thousand, two hundred twelve".