21274747312 has 80 divisors (see below), whose sum is σ = 51197903680. Its totient is φ = 8339106816.

The previous prime is 21274747309. The next prime is 21274747313. The reversal of 21274747312 is 21374747212.

It is a super-2 number, since 2×21274747312² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21274747313) 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, 91678 + ... + 225730.

It is an arithmetic number, because the mean of its divisors is an integer number (639973796).

Almost surely, 2^21274747312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21274747312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25598951840).

21274747312 is an abundant number, since it is smaller than the sum of its proper divisors (29923156368).

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

21274747312 is a wasteful number, since it uses less digits than its factorization.

21274747312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134190 (or 134184 counting only the distinct ones).

The product of its digits is 131712, while the sum is 40.

The spelling of 21274747312 in words is "twenty-one billion, two hundred seventy-four million, seven hundred forty-seven thousand, three hundred twelve".