21956546037 has 4 divisors (see below), whose sum is σ = 29275394720. Its totient is φ = 14637697356.

The previous prime is 21956546011. The next prime is 21956546041. The reversal of 21956546037 is 73064565912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21956546037 - 2¹¹ = 21956543989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956546047) 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, 3659424337 + ... + 3659424342.

It is an arithmetic number, because the mean of its divisors is an integer number (7318848680).

Almost surely, 2^21956546037 is an apocalyptic number.

It is an amenable number.

21956546037 is a deficient number, since it is larger than the sum of its proper divisors (7318848683).

21956546037 is an equidigital number, since it uses as much as digits as its factorization.

21956546037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7318848682.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The spelling of 21956546037 in words is "twenty-one billion, nine hundred fifty-six million, five hundred forty-six thousand, thirty-seven".