21942352 has 10 divisors (see below), whose sum is σ = 42513338. Its totient is φ = 10971168.

The previous prime is 21942317. The next prime is 21942377. The reversal of 21942352 is 25324912.

It can be written as a sum of positive squares in only one way, i.e., 21013056 + 929296 = 4584^2 + 964^2 .

It is a super-2 number, since 2×21942352² = 962933622583808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21942352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685683 + ... + 685714.

Almost surely, 2^21942352 is an apocalyptic number.

It is an amenable number.

21942352 is a deficient number, since it is larger than the sum of its proper divisors (20570986).

21942352 is a wasteful number, since it uses less digits than its factorization.

21942352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371405 (or 1371399 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21942352 is about 4684.2664313636. The cubic root of 21942352 is about 279.9589735808.

The spelling of 21942352 in words is "twenty-one million, nine hundred forty-two thousand, three hundred fifty-two".