21460890 has 32 divisors (see below), whose sum is σ = 56189376. Its totient is φ = 5202560.

The previous prime is 21460889. The next prime is 21460927. The reversal of 21460890 is 9806412.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32187 + ... + 32846.

It is an arithmetic number, because the mean of its divisors is an integer number (1755918).

Almost surely, 2^21460890 is an apocalyptic number.

21460890 is an abundant number, since it is smaller than the sum of its proper divisors (34728486).

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

21460890 is a wasteful number, since it uses less digits than its factorization.

21460890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65054.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21460890 is about 4632.5899883327. The cubic root of 21460890 is about 277.8961795097.

The spelling of 21460890 in words is "twenty-one million, four hundred sixty thousand, eight hundred ninety".