21196662536 has 64 divisors (see below), whose sum is σ = 46201190400. Its totient is φ = 8929357632.

The previous prime is 21196662521. The next prime is 21196662559. The reversal of 21196662536 is 63526669112.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 993695 + ... + 1014801.

It is an arithmetic number, because the mean of its divisors is an integer number (721893600).

Almost surely, 2^21196662536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21196662536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23100595200).

21196662536 is an abundant number, since it is smaller than the sum of its proper divisors (25004527864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21196662536 is a wasteful number, since it uses less digits than its factorization.

21196662536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21426 (or 21422 counting only the distinct ones).

The product of its digits is 699840, while the sum is 47.

The spelling of 21196662536 in words is "twenty-one billion, one hundred ninety-six million, six hundred sixty-two thousand, five hundred thirty-six".