21406873480 has 32 divisors (see below), whose sum is σ = 48174503040. Its totient is φ = 8561142720.

The previous prime is 21406873429. The next prime is 21406873489. The reversal of 21406873480 is 8437860412.

It is not an unprimeable number, because it can be changed into a prime (21406873489) 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, 178495 + ... + 273265.

It is an arithmetic number, because the mean of its divisors is an integer number (1505453220).

Almost surely, 2^21406873480 is an apocalyptic number.

21406873480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21406873480 is an abundant number, since it is smaller than the sum of its proper divisors (26767629560).

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

21406873480 is a wasteful number, since it uses less digits than its factorization.

21406873480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100429 (or 100425 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 21406873480 in words is "twenty-one billion, four hundred six million, eight hundred seventy-three thousand, four hundred eighty".