21520455413460 has 48 divisors (see below), whose sum is σ = 60327916889856. Its totient is φ = 5732060326272.

The previous prime is 21520455413453. The next prime is 21520455413461. The reversal of 21520455413460 is 6431455402512.

21520455413460 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520455413461) 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, 210191644 + ... + 210294003.

It is an arithmetic number, because the mean of its divisors is an integer number (1256831601872).

Almost surely, 2^{21520455413460} is an apocalyptic number.

21520455413460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21520455413460 is an abundant number, since it is smaller than the sum of its proper divisors (38807461476396).

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

21520455413460 is a wasteful number, since it uses less digits than its factorization.

21520455413460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420486512 (or 420486510 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 21520455413460 in words is "twenty-one trillion, five hundred twenty billion, four hundred fifty-five million, four hundred thirteen thousand, four hundred sixty".