21934618 has 8 divisors (see below), whose sum is σ = 33602112. Its totient is φ = 10733916.

The previous prime is 21934613. The next prime is 21934667. The reversal of 21934618 is 81643912.

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

It is a super-2 number, since 2×21934618² = 962254933611848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21934613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116580 + ... + 116767.

It is an arithmetic number, because the mean of its divisors is an integer number (4200264).

Almost surely, 2^21934618 is an apocalyptic number.

21934618 is a deficient number, since it is larger than the sum of its proper divisors (11667494).

21934618 is a wasteful number, since it uses less digits than its factorization.

21934618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233396.

The product of its digits is 10368, while the sum is 34.

The square root of 21934618 is about 4683.4408291341. The cubic root of 21934618 is about 279.9260774243.

The spelling of 21934618 in words is "twenty-one million, nine hundred thirty-four thousand, six hundred eighteen".