21075257012 has 12 divisors (see below), whose sum is σ = 36885399936. Its totient is φ = 10536571320.

The previous prime is 21075257009. The next prime is 21075257057.

21075257012 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21075257012.

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, 218564 + ... + 299867.

It is an arithmetic number, because the mean of its divisors is an integer number (3073783328).

Almost surely, 2^21075257012 is an apocalyptic number.

It is an amenable number.

21075257012 is a deficient number, since it is larger than the sum of its proper divisors (15810142924).

21075257012 is a wasteful number, since it uses less digits than its factorization.

21075257012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528598 (or 528596 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 21075257012 in words is "twenty-one billion, seventy-five million, two hundred fifty-seven thousand, twelve".