21274847880 has 512 divisors, whose sum is σ = 79988912640. Its totient is φ = 4447272960.

The previous prime is 21274847873. The next prime is 21274847977. The reversal of 21274847880 is 8874847212.

It is a happy number.

It is a Cunningham number, because it is equal to 145859²-1.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 67970604 + ... + 67970916.

It is an arithmetic number, because the mean of its divisors is an integer number (156228345).

Almost surely, 2^21274847880 is an apocalyptic number.

21274847880 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 21274847880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39994456320).

21274847880 is an abundant number, since it is smaller than the sum of its proper divisors (58714064760).

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

21274847880 is a wasteful number, since it uses less digits than its factorization.

21274847880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 51.

The spelling of 21274847880 in words is "twenty-one billion, two hundred seventy-four million, eight hundred forty-seven thousand, eight hundred eighty".