21000521050 has 48 divisors (see below), whose sum is σ = 40141716480. Its totient is φ = 8168074560.

The previous prime is 21000521011. The next prime is 21000521063. The reversal of 21000521050 is 5012500012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4524631 + ... + 4529269.

It is an arithmetic number, because the mean of its divisors is an integer number (836285760).

Almost surely, 2^21000521050 is an apocalyptic number.

21000521050 is a deficient number, since it is larger than the sum of its proper divisors (19141195430).

21000521050 is a wasteful number, since it uses less digits than its factorization.

21000521050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135 (or 7130 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The spelling of 21000521050 in words is "twenty-one billion, five hundred twenty-one thousand, fifty".