21460476820 has 48 divisors (see below), whose sum is σ = 47460873600. Its totient is φ = 8128632960.

The previous prime is 21460476799. The next prime is 21460476823. The reversal of 21460476820 is 2867406412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460476823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892921 + ... + 916639.

It is an arithmetic number, because the mean of its divisors is an integer number (988768200).

Almost surely, 2^21460476820 is an apocalyptic number.

21460476820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21460476820 is an abundant number, since it is smaller than the sum of its proper divisors (26000396780).

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

21460476820 is a wasteful number, since it uses less digits than its factorization.

21460476820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26128 (or 26126 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 21460476820 in words is "twenty-one billion, four hundred sixty million, four hundred seventy-six thousand, eight hundred twenty".