22036631521 has 4 divisors (see below), whose sum is σ = 22038289812. Its totient is φ = 22034973232.

The previous prime is 22036631501. The next prime is 22036631557. The reversal of 22036631521 is 12513663022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12401049600 + 9635581921 = 111360^2 + 98161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22036631521 is a prime.

It is a super-2 number, since 2×22036631521² (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 (22036631501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809050 + ... + 835843.

It is an arithmetic number, because the mean of its divisors is an integer number (5509572453).

Almost surely, 2^22036631521 is an apocalyptic number.

It is an amenable number.

22036631521 is a deficient number, since it is larger than the sum of its proper divisors (1658291).

22036631521 is a wasteful number, since it uses less digits than its factorization.

22036631521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658290.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 22036631521 in words is "twenty-two billion, thirty-six million, six hundred thirty-one thousand, five hundred twenty-one".