21219936319 has 4 divisors (see below), whose sum is σ = 21247821360. Its totient is φ = 21192051280.

The previous prime is 21219936317. The next prime is 21219936337. The reversal of 21219936319 is 91363991212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21219936319 - 2¹ = 21219936317 is a prime.

It is a super-2 number, since 2×21219936319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21219936317) 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, 13941379 + ... + 13942900.

It is an arithmetic number, because the mean of its divisors is an integer number (5311955340).

Almost surely, 2^21219936319 is an apocalyptic number.

21219936319 is a deficient number, since it is larger than the sum of its proper divisors (27885041).

21219936319 is an equidigital number, since it uses as much as digits as its factorization.

21219936319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27885040.

The product of its digits is 157464, while the sum is 46.

The spelling of 21219936319 in words is "twenty-one billion, two hundred nineteen million, nine hundred thirty-six thousand, three hundred nineteen".