21642050 has 24 divisors (see below), whose sum is σ = 40771200. Its totient is φ = 8545680.

The previous prime is 21642017. The next prime is 21642067. The reversal of 21642050 is 5024612.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1211 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (1698800).

Almost surely, 2^21642050 is an apocalyptic number.

21642050 is a deficient number, since it is larger than the sum of its proper divisors (19129150).

21642050 is a wasteful number, since it uses less digits than its factorization.

21642050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5570 (or 5565 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21642050 is about 4652.1016755871. The cubic root of 21642050 is about 278.6759339907.

Adding to 21642050 its reverse (5024612), we get a palindrome (26666662).

The spelling of 21642050 in words is "twenty-one million, six hundred forty-two thousand, fifty".