21670072452 has 96 divisors (see below), whose sum is σ = 64245565440. Its totient is φ = 6187790880.

The previous prime is 21670072441. The next prime is 21670072453. The reversal of 21670072452 is 25427007612.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21670072453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1434177 + ... + 1449207.

It is an arithmetic number, because the mean of its divisors is an integer number (669224640).

Almost surely, 2^21670072452 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 21670072452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32122782720).

21670072452 is an abundant number, since it is smaller than the sum of its proper divisors (42575492988).

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

21670072452 is a wasteful number, since it uses less digits than its factorization.

21670072452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16958 (or 16950 counting only the distinct ones).

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

The spelling of 21670072452 in words is "twenty-one billion, six hundred seventy million, seventy-two thousand, four hundred fifty-two".