21980486 has 16 divisors (see below), whose sum is σ = 36426240. Its totient is φ = 9863880.

The previous prime is 21980467. The next prime is 21980513. The reversal of 21980486 is 68408912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4586 + ... + 8061.

It is an arithmetic number, because the mean of its divisors is an integer number (2276640).

Almost surely, 2^21980486 is an apocalyptic number.

21980486 is a deficient number, since it is larger than the sum of its proper divisors (14445754).

21980486 is a wasteful number, since it uses less digits than its factorization.

21980486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12739.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21980486 is about 4688.3350989450. The cubic root of 21980486 is about 280.1210615955.

The spelling of 21980486 in words is "twenty-one million, nine hundred eighty thousand, four hundred eighty-six".