21110520050 has 24 divisors (see below), whose sum is σ = 39654344772. Its totient is φ = 8360600000.

The previous prime is 21110520037. The next prime is 21110520071. The reversal of 21110520050 is 5002501112.

It can be written as a sum of positive squares in 6 ways, for example, as 18257144161 + 2853375889 = 135119^2 + 53417^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2085101 + ... + 2095200.

Almost surely, 2^21110520050 is an apocalyptic number.

21110520050 is a deficient number, since it is larger than the sum of its proper divisors (18543824722).

21110520050 is a wasteful number, since it uses less digits than its factorization.

21110520050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180414 (or 4180409 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The spelling of 21110520050 in words is "twenty-one billion, one hundred ten million, five hundred twenty thousand, fifty".