21960153840 has 80 divisors (see below), whose sum is σ = 68103453600. Its totient is φ = 5853720576.

The previous prime is 21960153833. The next prime is 21960153857. The reversal of 21960153840 is 4835106912.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 638196 + ... + 671724.

It is an arithmetic number, because the mean of its divisors is an integer number (851293170).

Almost surely, 2^21960153840 is an apocalyptic number.

21960153840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21960153840 is an abundant number, since it is smaller than the sum of its proper divisors (46143299760).

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

21960153840 is a wasteful number, since it uses less digits than its factorization.

21960153840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36274 (or 36268 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 21960153840 in words is "twenty-one billion, nine hundred sixty million, one hundred fifty-three thousand, eight hundred forty".