21510500133 has 16 divisors (see below), whose sum is σ = 28785773376. Its totient is φ = 14287848960.

The previous prime is 21510500117. The next prime is 21510500173. The reversal of 21510500133 is 33100501512.

It is not a de Polignac number, because 21510500133 - 2⁴ = 21510500117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510500173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376343 + ... + 1391883.

It is an arithmetic number, because the mean of its divisors is an integer number (1799110836).

Almost surely, 2^21510500133 is an apocalyptic number.

It is an amenable number.

21510500133 is a deficient number, since it is larger than the sum of its proper divisors (7275273243).

21510500133 is a wasteful number, since it uses less digits than its factorization.

21510500133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17204.

The product of its (nonzero) digits is 450, while the sum is 21.

The spelling of 21510500133 in words is "twenty-one billion, five hundred ten million, five hundred thousand, one hundred thirty-three".