21980682 has 24 divisors (see below), whose sum is σ = 50132160. Its totient is φ = 6941160.

The previous prime is 21980681. The next prime is 21980683. The reversal of 21980682 is 28608912.

It is an interprime number because it is at equal distance from previous prime (21980681) and next prime (21980683).

It is not an unprimeable number, because it can be changed into a prime (21980681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31794 + ... + 32477.

It is an arithmetic number, because the mean of its divisors is an integer number (2088840).

Almost surely, 2^21980682 is an apocalyptic number.

21980682 is an abundant number, since it is smaller than the sum of its proper divisors (28151478).

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

21980682 is a wasteful number, since it uses less digits than its factorization.

21980682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64298 (or 64295 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21980682 is about 4688.3560018412. The cubic root of 21980682 is about 280.1218942062.

The spelling of 21980682 in words is "twenty-one million, nine hundred eighty thousand, six hundred eighty-two".