21956546015 has 16 divisors (see below), whose sum is σ = 27836958720. Its totient is φ = 16579326240.

The previous prime is 21956546011. The next prime is 21956546041. The reversal of 21956546015 is 51064565912.

It is not a de Polignac number, because 21956546015 - 2² = 21956546011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956546011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400679 + ... + 452168.

It is an arithmetic number, because the mean of its divisors is an integer number (1739809920).

Almost surely, 2^21956546015 is an apocalyptic number.

21956546015 is a deficient number, since it is larger than the sum of its proper divisors (5880412705).

21956546015 is a wasteful number, since it uses less digits than its factorization.

21956546015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853142.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 21956546015 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, fifteen".