21486680220 has 24 divisors (see below), whose sum is σ = 60162704784. Its totient is φ = 5729781376.

The previous prime is 21486680213. The next prime is 21486680287. The reversal of 21486680220 is 2208668412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179055609 + ... + 179055728.

It is an arithmetic number, because the mean of its divisors is an integer number (2506779366).

Almost surely, 2^21486680220 is an apocalyptic number.

21486680220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21486680220 is an abundant number, since it is smaller than the sum of its proper divisors (38676024564).

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

21486680220 is a wasteful number, since it uses less digits than its factorization.

21486680220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358111349 (or 358111347 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 21486680220 in words is "twenty-one billion, four hundred eighty-six million, six hundred eighty thousand, two hundred twenty".