21276080 has 40 divisors (see below), whose sum is σ = 56535072. Its totient is φ = 7294464.

The previous prime is 21276071. The next prime is 21276083. The reversal of 21276080 is 8067212.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21276083) 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, 18437 + ... + 19556.

Almost surely, 2^21276080 is an apocalyptic number.

21276080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21276080 is an abundant number, since it is smaller than the sum of its proper divisors (35258992).

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

21276080 is a wasteful number, since it uses less digits than its factorization.

21276080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38013 (or 38007 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21276080 is about 4612.6001344144. The cubic root of 21276080 is about 277.0961796796.

The spelling of 21276080 in words is "twenty-one million, two hundred seventy-six thousand, eighty".