21020510133 has 96 divisors (see below), whose sum is σ = 36585768960. Its totient is φ = 11376812160.

The previous prime is 21020510131. The next prime is 21020510171. The reversal of 21020510133 is 33101502012.

21020510133 is a `hidden beast` number, since 2 + 1 + 0 + 20 + 510 + 133 = 666.

It is not a de Polignac number, because 21020510133 - 2¹ = 21020510131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020510131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 45011566 + ... + 45012032.

It is an arithmetic number, because the mean of its divisors is an integer number (381101760).

Almost surely, 2^21020510133 is an apocalyptic number.

It is an amenable number.

21020510133 is a deficient number, since it is larger than the sum of its proper divisors (15565258827).

21020510133 is a wasteful number, since it uses less digits than its factorization.

21020510133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The spelling of 21020510133 in words is "twenty-one billion, twenty million, five hundred ten thousand, one hundred thirty-three".