21422743272 has 160 divisors (see below), whose sum is σ = 69031797120. Its totient is φ = 6080054400.

The previous prime is 21422743241. The next prime is 21422743337. The reversal of 21422743272 is 27234722412.

21422743272 is a `hidden beast` number, since 21 + 42 + 274 + 327 + 2 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 669298 + ... + 700574.

It is an arithmetic number, because the mean of its divisors is an integer number (431448732).

Almost surely, 2^21422743272 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 21422743272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34515898560).

21422743272 is an abundant number, since it is smaller than the sum of its proper divisors (47609053848).

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

21422743272 is a wasteful number, since it uses less digits than its factorization.

21422743272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31453 (or 31440 counting only the distinct ones).

The product of its digits is 75264, while the sum is 36.

The spelling of 21422743272 in words is "twenty-one billion, four hundred twenty-two million, seven hundred forty-three thousand, two hundred seventy-two".