21287480060 has 48 divisors (see below), whose sum is σ = 55734497280. Its totient is φ = 6635058240.

The previous prime is 21287480059. The next prime is 21287480089. The reversal of 21287480060 is 6008478212.

It is a junction number, because it is equal to n+sod(n) for n = 21287479996 and 21287480023.

It is a congruent number.

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, 6909980 + ... + 6913059.

It is an arithmetic number, because the mean of its divisors is an integer number (1161135360).

Almost surely, 2^21287480060 is an apocalyptic number.

21287480060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21287480060 is an abundant number, since it is smaller than the sum of its proper divisors (34447017220).

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

21287480060 is a wasteful number, since it uses less digits than its factorization.

21287480060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13823066 (or 13823064 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The spelling of 21287480060 in words is "twenty-one billion, two hundred eighty-seven million, four hundred eighty thousand, sixty".