21407475355420 has 48 divisors (see below), whose sum is σ = 56048662752768. Its totient is φ = 6672459850560.

The previous prime is 21407475355327. The next prime is 21407475355423. The reversal of 21407475355420 is 2455357470412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407475355423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6950477472 + ... + 6950480551.

It is an arithmetic number, because the mean of its divisors is an integer number (1167680474016).

Almost surely, 2^{21407475355420} is an apocalyptic number.

21407475355420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21407475355420 is an abundant number, since it is smaller than the sum of its proper divisors (34641187397348).

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

21407475355420 is a wasteful number, since it uses less digits than its factorization.

21407475355420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13900958050 (or 13900958048 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 49.

The spelling of 21407475355420 in words is "twenty-one trillion, four hundred seven billion, four hundred seventy-five million, three hundred fifty-five thousand, four hundred twenty".