21970452 has 48 divisors (see below), whose sum is σ = 60179840. Its totient is φ = 6106752.

The previous prime is 21970447. The next prime is 21970469. The reversal of 21970452 is 25407912.

It is a super-2 number, since 2×21970452² = 965401522168608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427 + ... + 6642.

Almost surely, 2^21970452 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 21970452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30089920).

21970452 is an abundant number, since it is smaller than the sum of its proper divisors (38209388).

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

21970452 is a wasteful number, since it uses less digits than its factorization.

21970452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120 (or 7118 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21970452 is about 4687.2648741030. The cubic root of 21970452 is about 280.0784304099.

It can be divided in two parts, 21970 and 452, that added together give a palindrome (22422).

The spelling of 21970452 in words is "twenty-one million, nine hundred seventy thousand, four hundred fifty-two".