21913676460 has 144 divisors (see below), whose sum is σ = 71631495936. Its totient is φ = 5390608896.

The previous prime is 21913676453. The next prime is 21913676461. The reversal of 21913676460 is 6467631912.

21913676460 is a `hidden beast` number, since 2 + 1 + 91 + 36 + 76 + 460 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21913676461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6917797 + ... + 6920963.

It is an arithmetic number, because the mean of its divisors is an integer number (497440944).

Almost surely, 2^21913676460 is an apocalyptic number.

21913676460 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 21913676460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35815747968).

21913676460 is an abundant number, since it is smaller than the sum of its proper divisors (49717819476).

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

21913676460 is a wasteful number, since it uses less digits than its factorization.

21913676460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6152 (or 6147 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 21913676460 in words is "twenty-one billion, nine hundred thirteen million, six hundred seventy-six thousand, four hundred sixty".