21219304618 has 8 divisors (see below), whose sum is σ = 31830350400. Its totient is φ = 10609187820.

The previous prime is 21219304597. The next prime is 21219304621. The reversal of 21219304618 is 81640391212.

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

It is a super-2 number, since 2×21219304618² (a number of 21 digits) contains 22 as substring.

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, 172018 + ... + 268381.

It is an arithmetic number, because the mean of its divisors is an integer number (3978793800).

Almost surely, 2^21219304618 is an apocalyptic number.

21219304618 is a deficient number, since it is larger than the sum of its proper divisors (10611045782).

21219304618 is a wasteful number, since it uses less digits than its factorization.

21219304618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464492.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 21219304618 in words is "twenty-one billion, two hundred nineteen million, three hundred four thousand, six hundred eighteen".