21244462636 has 12 divisors (see below), whose sum is σ = 37179655128. Its totient is φ = 10621704032.

The previous prime is 21244462597. The next prime is 21244462639. The reversal of 21244462636 is 63626444212.

It is not an unprimeable number, because it can be changed into a prime (21244462639) 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, 32926 + ... + 208741.

It is an arithmetic number, because the mean of its divisors is an integer number (3098304594).

Almost surely, 2^21244462636 is an apocalyptic number.

It is an amenable number.

21244462636 is a deficient number, since it is larger than the sum of its proper divisors (15935192492).

21244462636 is a wasteful number, since it uses less digits than its factorization.

21244462636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263648 (or 263646 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The spelling of 21244462636 in words is "twenty-one billion, two hundred forty-four million, four hundred sixty-two thousand, six hundred thirty-six".