21222537633 has 36 divisors (see below), whose sum is σ = 34247402644. Its totient is φ = 12651249600.

The previous prime is 21222537613. The next prime is 21222537683. The reversal of 21222537633 is 33673522212.

21222537633 is a `hidden beast` number, since 2 + 12 + 2 + 2 + 5 + 3 + 7 + 633 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7798302864 + 13424234769 = 88308^2 + 115863^2 .

It is not a de Polignac number, because 21222537633 - 2¹⁶ = 21222472097 is a prime.

It is a super-2 number, since 2×21222537633² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222537613) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 93310 + ... + 226167.

Almost surely, 2^21222537633 is an apocalyptic number.

It is an amenable number.

21222537633 is a deficient number, since it is larger than the sum of its proper divisors (13024865011).

21222537633 is a wasteful number, since it uses less digits than its factorization.

21222537633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319566 (or 319552 counting only the distinct ones).

The product of its digits is 90720, while the sum is 36.

It can be divided in two parts, 21222 and 537633, that added together give a palindrome (558855).

The spelling of 21222537633 in words is "twenty-one billion, two hundred twenty-two million, five hundred thirty-seven thousand, six hundred thirty-three".