21316732633 has 32 divisors (see below), whose sum is σ = 26545722624. Its totient is φ = 16698120192.

The previous prime is 21316732609. The next prime is 21316732637. The reversal of 21316732633 is 33623761312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21316732633 - 2¹³ = 21316724441 is a prime.

It is a super-2 number, since 2×21316732633² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21316732592 and 21316732601.

It is not an unprimeable number, because it can be changed into a prime (21316732637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2298141 + ... + 2307397.

It is an arithmetic number, because the mean of its divisors is an integer number (829553832).

Almost surely, 2^21316732633 is an apocalyptic number.

It is an amenable number.

21316732633 is a deficient number, since it is larger than the sum of its proper divisors (5228989991).

21316732633 is a wasteful number, since it uses less digits than its factorization.

21316732633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9841.

The product of its digits is 81648, while the sum is 37.

The spelling of 21316732633 in words is "twenty-one billion, three hundred sixteen million, seven hundred thirty-two thousand, six hundred thirty-three".