21937541468 has 24 divisors (see below), whose sum is σ = 39643599744. Its totient is φ = 10611057600.

The previous prime is 21937541453. The next prime is 21937541497. The reversal of 21937541468 is 86414573912.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323846 + ... + 385682.

It is an arithmetic number, because the mean of its divisors is an integer number (1651816656).

Almost surely, 2^21937541468 is an apocalyptic number.

It is an amenable number.

21937541468 is a deficient number, since it is larger than the sum of its proper divisors (17706058276).

21937541468 is a wasteful number, since it uses less digits than its factorization.

21937541468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64733 (or 64731 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The spelling of 21937541468 in words is "twenty-one billion, nine hundred thirty-seven million, five hundred forty-one thousand, four hundred sixty-eight".