21477080 has 32 divisors (see below), whose sum is σ = 48913200. Its totient is φ = 8486016.

The previous prime is 21477077. The next prime is 21477089. The reversal of 21477080 is 8077412.

It is a super-2 number, since 2×21477080² = 922529930652800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477089) 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, 86 + ... + 6554.

Almost surely, 2^21477080 is an apocalyptic number.

21477080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24456600).

21477080 is an abundant number, since it is smaller than the sum of its proper divisors (27436120).

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

21477080 is a wasteful number, since it uses less digits than its factorization.

21477080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6563 (or 6559 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21477080 is about 4634.3370615440. The cubic root of 21477080 is about 277.9660431585.

The spelling of 21477080 in words is "twenty-one million, four hundred seventy-seven thousand, eighty".