21273080 has 16 divisors (see below), whose sum is σ = 47864520. Its totient is φ = 8509216.

The previous prime is 21273073. The next prime is 21273097. The reversal of 21273080 is 8037212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265874 + ... + 265953.

Almost surely, 2^21273080 is an apocalyptic number.

21273080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21273080 is an abundant number, since it is smaller than the sum of its proper divisors (26591440).

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

21273080 is a wasteful number, since it uses less digits than its factorization.

21273080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531838 (or 531834 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21273080 is about 4612.2749267579. The cubic root of 21273080 is about 277.0831552313.

The spelling of 21273080 in words is "twenty-one million, two hundred seventy-three thousand, eighty".