21227371452 has 72 divisors (see below), whose sum is σ = 61339046496. Its totient is φ = 6063427584.

The previous prime is 21227371433. The next prime is 21227371471. The reversal of 21227371452 is 25417372212.

21227371452 is a `hidden beast` number, since 21 + 227 + 371 + 45 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21227371433) and next prime (21227371471).

It is a super-2 number, since 2×21227371452² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1310668 + ... + 1326764.

Almost surely, 2^21227371452 is an apocalyptic number.

It is an amenable number.

21227371452 is an abundant number, since it is smaller than the sum of its proper divisors (40111675044).

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

21227371452 is a wasteful number, since it uses less digits than its factorization.

21227371452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21347 (or 21342 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The spelling of 21227371452 in words is "twenty-one billion, two hundred twenty-seven million, three hundred seventy-one thousand, four hundred fifty-two".