21480855 has 32 divisors (see below), whose sum is σ = 37732608. Its totient is φ = 10348800.

The previous prime is 21480841. The next prime is 21480859. The reversal of 21480855 is 55808412.

It is not a de Polignac number, because 21480855 - 2⁴ = 21480839 is a prime.

It is a super-2 number, since 2×21480855² = 922854263062050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34507 + ... + 35123.

It is an arithmetic number, because the mean of its divisors is an integer number (1179144).

Almost surely, 2^21480855 is an apocalyptic number.

21480855 is a deficient number, since it is larger than the sum of its proper divisors (16251753).

21480855 is a wasteful number, since it uses less digits than its factorization.

21480855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 21480855 is about 4634.7443295181. The cubic root of 21480855 is about 277.9823281212.

The spelling of 21480855 in words is "twenty-one million, four hundred eighty thousand, eight hundred fifty-five".