21727214919 has 12 divisors (see below), whose sum is σ = 31385200392. Its totient is φ = 14484142800.

The previous prime is 21727214893. The next prime is 21727214959. The reversal of 21727214919 is 91941272712.

It is a happy number.

21727214919 is a `hidden beast` number, since 21 + 72 + 72 + 1 + 491 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21727214919 is a prime.

It is a super-2 number, since 2×21727214919² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727214959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225424 + ... + 307034.

It is an arithmetic number, because the mean of its divisors is an integer number (2615433366).

Almost surely, 2^21727214919 is an apocalyptic number.

21727214919 is a deficient number, since it is larger than the sum of its proper divisors (9657985473).

21727214919 is a wasteful number, since it uses less digits than its factorization.

21727214919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111198 (or 111195 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The spelling of 21727214919 in words is "twenty-one billion, seven hundred twenty-seven million, two hundred fourteen thousand, nine hundred nineteen".