21477395160 has 256 divisors, whose sum is σ = 77246870400. Its totient is φ = 5276565504.

The previous prime is 21477395153. The next prime is 21477395197. The reversal of 21477395160 is 6159377412.

21477395160 is a `hidden beast` number, since 21 + 47 + 73 + 9 + 516 + 0 = 666.

It is a super-2 number, since 2×21477395160² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9447784 + ... + 9450056.

Almost surely, 2^21477395160 is an apocalyptic number.

21477395160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477395160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38623435200).

21477395160 is an abundant number, since it is smaller than the sum of its proper divisors (55769475240).

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

21477395160 is a wasteful number, since it uses less digits than its factorization.

21477395160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979 (or 2969 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 21477395160 in words is "twenty-one billion, four hundred seventy-seven million, three hundred ninety-five thousand, one hundred sixty".