21341980 has 36 divisors (see below), whose sum is σ = 49268520. Its totient is φ = 7759840.

The previous prime is 21341951. The next prime is 21341993. The reversal of 21341980 is 8914312.

It is a happy number.

It is a super-2 number, since 2×21341980² = 910960220640800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1990 + ... + 6829.

It is an arithmetic number, because the mean of its divisors is an integer number (1368570).

Almost surely, 2^21341980 is an apocalyptic number.

21341980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21341980 is an abundant number, since it is smaller than the sum of its proper divisors (27926540).

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

21341980 is a wasteful number, since it uses less digits than its factorization.

21341980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8850 (or 8837 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21341980 is about 4619.7380878141. The cubic root of 21341980 is about 277.3819750779.

It can be divided in two parts, 2134 and 1980, that added together give a palindrome (4114).

The spelling of 21341980 in words is "twenty-one million, three hundred forty-one thousand, nine hundred eighty".