21842402 has 8 divisors (see below), whose sum is σ = 33252816. Its totient is φ = 10758132.

The previous prime is 21842393. The next prime is 21842441. The reversal of 21842402 is 20424812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81368 + ... + 81635.

It is an arithmetic number, because the mean of its divisors is an integer number (4156602).

Almost surely, 2^21842402 is an apocalyptic number.

21842402 is a deficient number, since it is larger than the sum of its proper divisors (11410414).

21842402 is a wasteful number, since it uses less digits than its factorization.

21842402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163072.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 21842402 is about 4673.5855614293. The cubic root of 21842402 is about 279.5332444672.

The spelling of 21842402 in words is "twenty-one million, eight hundred forty-two thousand, four hundred two".