21980334 has 16 divisors (see below), whose sum is σ = 44046288. Its totient is φ = 7312512.

The previous prime is 21980323. The next prime is 21980339. The reversal of 21980334 is 43308912.

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, 54 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (2752893).

Almost surely, 2^21980334 is an apocalyptic number.

21980334 is an abundant number, since it is smaller than the sum of its proper divisors (22065954).

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

21980334 is a wasteful number, since it uses less digits than its factorization.

21980334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21980334 is about 4688.3188884716. The cubic root of 21980334 is about 280.1204158940.

The spelling of 21980334 in words is "twenty-one million, nine hundred eighty thousand, three hundred thirty-four".