21956546036 has 12 divisors (see below), whose sum is σ = 38515226820. Its totient is φ = 10952195520.

The previous prime is 21956546011. The next prime is 21956546041. The reversal of 21956546036 is 63064565912.

It can be written as a sum of positive squares in 2 ways, for example, as 802588900 + 21153957136 = 28330^2 + 145444^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6517481 + ... + 6520848.

It is an arithmetic number, because the mean of its divisors is an integer number (3209602235).

Almost surely, 2^21956546036 is an apocalyptic number.

It is an amenable number.

21956546036 is a deficient number, since it is larger than the sum of its proper divisors (16558680784).

21956546036 is a wasteful number, since it uses less digits than its factorization.

21956546036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13038754 (or 13038752 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 21956546036 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, thirty-six".