21642962 has 8 divisors (see below), whose sum is σ = 35415792. Its totient is φ = 9837700.

The previous prime is 21642953. The next prime is 21642979. The reversal of 21642962 is 26924612.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491864 + ... + 491907.

It is an arithmetic number, because the mean of its divisors is an integer number (4426974).

Almost surely, 2^21642962 is an apocalyptic number.

21642962 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21642962 is a deficient number, since it is larger than the sum of its proper divisors (13772830).

21642962 is a wasteful number, since it uses less digits than its factorization.

21642962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983784.

The product of its digits is 10368, while the sum is 32.

The square root of 21642962 is about 4652.1996947681. The cubic root of 21642962 is about 278.6798484209.

The spelling of 21642962 in words is "twenty-one million, six hundred forty-two thousand, nine hundred sixty-two".