21819962 has 8 divisors (see below), whose sum is σ = 34153056. Its totient is φ = 10435612.

The previous prime is 21819949. The next prime is 21819979. The reversal of 21819962 is 26991812.

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

It is a super-2 number, since 2×21819962² = 952221483362888, which contains 22 as substring.

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, 237128 + ... + 237219.

It is an arithmetic number, because the mean of its divisors is an integer number (4269132).

Almost surely, 2^21819962 is an apocalyptic number.

21819962 is a deficient number, since it is larger than the sum of its proper divisors (12333094).

21819962 is a wasteful number, since it uses less digits than its factorization.

21819962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474372.

The product of its digits is 15552, while the sum is 38.

The square root of 21819962 is about 4671.1842181614. The cubic root of 21819962 is about 279.4374846182.

The spelling of 21819962 in words is "twenty-one million, eight hundred nineteen thousand, nine hundred sixty-two".