21968096940 has 48 divisors (see below), whose sum is σ = 68345192160. Its totient is φ = 5858159040.

The previous prime is 21968096939. The next prime is 21968097037. The reversal of 21968096940 is 4969086912.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20340291 + ... + 20341370.

It is an arithmetic number, because the mean of its divisors is an integer number (1423858170).

Almost surely, 2^21968096940 is an apocalyptic number.

21968096940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21968096940 is an abundant number, since it is smaller than the sum of its proper divisors (46377095220).

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

21968096940 is a wasteful number, since it uses less digits than its factorization.

21968096940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40681679 (or 40681671 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 21968096940 in words is "twenty-one billion, nine hundred sixty-eight million, ninety-six thousand, nine hundred forty".