21736744161626 has 16 divisors (see below), whose sum is σ = 35423938413864. Its totient is φ = 9943561657344.

The previous prime is 21736744161607. The next prime is 21736744161631. The reversal of 21736744161626 is 62616144763712.

It can be written as a sum of positive squares in 4 ways, for example, as 3733686675625 + 18003057486001 = 1932275^2 + 4243001^2 .

It is a super-2 number, since 2×21736744161626² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3699238751 + ... + 3699244626.

Almost surely, 2^{21736744161626} is an apocalyptic number.

21736744161626 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21736744161626 is a deficient number, since it is larger than the sum of its proper divisors (13687194252238).

21736744161626 is a wasteful number, since it uses less digits than its factorization.

21736744161626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7398483505.

The product of its digits is 12192768, while the sum is 56.

The spelling of 21736744161626 in words is "twenty-one trillion, seven hundred thirty-six billion, seven hundred forty-four million, one hundred sixty-one thousand, six hundred twenty-six".