21980581790 has 8 divisors (see below), whose sum is σ = 39565047240. Its totient is φ = 8792232712.

The previous prime is 21980581691. The next prime is 21980581801. The reversal of 21980581790 is 9718508912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099029080 + ... + 1099029099.

It is an arithmetic number, because the mean of its divisors is an integer number (4945630905).

Almost surely, 2^21980581790 is an apocalyptic number.

21980581790 is a deficient number, since it is larger than the sum of its proper divisors (17584465450).

21980581790 is a wasteful number, since it uses less digits than its factorization.

21980581790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198058186.

The product of its (nonzero) digits is 362880, while the sum is 50.

The spelling of 21980581790 in words is "twenty-one billion, nine hundred eighty million, five hundred eighty-one thousand, seven hundred ninety".