21942402 has 16 divisors (see below), whose sum is σ = 43951872. Its totient is φ = 7302960.

The previous prime is 21942379. The next prime is 21942457. The reversal of 21942402 is 20424912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (2746992).

Almost surely, 2^21942402 is an apocalyptic number.

21942402 is an abundant number, since it is smaller than the sum of its proper divisors (22009470).

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

21942402 is a wasteful number, since it uses less digits than its factorization.

21942402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21942402 is about 4684.2717683755. The cubic root of 21942402 is about 279.9591862280.

The spelling of 21942402 in words is "twenty-one million, nine hundred forty-two thousand, four hundred two".