21980310 has 64 divisors (see below), whose sum is σ = 58924800. Its totient is φ = 5201280.

The previous prime is 21980293. The next prime is 21980317. The reversal of 21980310 is 1308912.

It is a super-2 number, since 2×21980310² = 966268055392200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980317) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 13416 + ... + 14964.

It is an arithmetic number, because the mean of its divisors is an integer number (920700).

Almost surely, 2^21980310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21980310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29462400).

21980310 is an abundant number, since it is smaller than the sum of its proper divisors (36944490).

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

21980310 is a wasteful number, since it uses less digits than its factorization.

21980310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21980310 is about 4688.3163289181. The cubic root of 21980310 is about 280.1203139408.

The spelling of 21980310 in words is "twenty-one million, nine hundred eighty thousand, three hundred ten".