21980359 has 8 divisors (see below), whose sum is σ = 23316480. Its totient is φ = 20662200.

The previous prime is 21980339. The next prime is 21980363. The reversal of 21980359 is 95308912.

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

It is a cyclic number.

It is not a de Polignac number, because 21980359 - 2⁹ = 21979847 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 (21980339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1927 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (2914560).

Almost surely, 2^21980359 is an apocalyptic number.

21980359 is a deficient number, since it is larger than the sum of its proper divisors (1336121).

21980359 is a wasteful number, since it uses less digits than its factorization.

21980359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8981.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 21980359 is about 4688.3215546718. The cubic root of 21980359 is about 280.1205220951.

The spelling of 21980359 in words is "twenty-one million, nine hundred eighty thousand, three hundred fifty-nine".