21802642 has 8 divisors (see below), whose sum is σ = 33399936. Its totient is φ = 10669332.

The previous prime is 21802621. The next prime is 21802661. The reversal of 21802642 is 24620812.

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, 115878 + ... + 116065.

It is an arithmetic number, because the mean of its divisors is an integer number (4174992).

Almost surely, 2^21802642 is an apocalyptic number.

21802642 is a deficient number, since it is larger than the sum of its proper divisors (11597294).

21802642 is a wasteful number, since it uses less digits than its factorization.

21802642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231992.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21802642 is about 4669.3299305147. The cubic root of 21802642 is about 279.3635288161.

The spelling of 21802642 in words is "twenty-one million, eight hundred two thousand, six hundred forty-two".