21357080 has 16 divisors (see below), whose sum is σ = 48053520. Its totient is φ = 8542816.

The previous prime is 21357071. The next prime is 21357101. The reversal of 21357080 is 8075312.

It is a super-2 number, since 2×21357080² = 912249732252800, 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 3 ways as a sum of consecutive naturals, for example, 266924 + ... + 267003.

It is an arithmetic number, because the mean of its divisors is an integer number (3003345).

Almost surely, 2^21357080 is an apocalyptic number.

21357080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21357080 is an abundant number, since it is smaller than the sum of its proper divisors (26696440).

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

21357080 is a wasteful number, since it uses less digits than its factorization.

21357080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533938 (or 533934 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21357080 is about 4621.3720906242. The cubic root of 21357080 is about 277.4473779504.

The spelling of 21357080 in words is "twenty-one million, three hundred fifty-seven thousand, eighty".