21127922460 has 36 divisors (see below), whose sum is σ = 64088032008. Its totient is φ = 5634112608.

The previous prime is 21127922449. The next prime is 21127922467. The reversal of 21127922460 is 6422972112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21127922467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58688494 + ... + 58688853.

Almost surely, 2^21127922460 is an apocalyptic number.

21127922460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21127922460 is an abundant number, since it is smaller than the sum of its proper divisors (42960109548).

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

21127922460 is a wasteful number, since it uses less digits than its factorization.

21127922460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117377362 (or 117377357 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21127922460 in words is "twenty-one billion, one hundred twenty-seven million, nine hundred twenty-two thousand, four hundred sixty".