21719215667814 has 32 divisors (see below), whose sum is σ = 49644074353920. Its totient is φ = 6205471087392.

The previous prime is 21719215667803. The next prime is 21719215667867. The reversal of 21719215667814 is 41876651291712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18529752 + ... + 19666980.

It is an arithmetic number, because the mean of its divisors is an integer number (1551377323560).

Almost surely, 2^{21719215667814} is an apocalyptic number.

21719215667814 is an abundant number, since it is smaller than the sum of its proper divisors (27924858686106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21719215667814 is a wasteful number, since it uses less digits than its factorization.

21719215667814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591964.

The product of its digits is 10160640, while the sum is 60.

The spelling of 21719215667814 in words is "twenty-one trillion, seven hundred nineteen billion, two hundred fifteen million, six hundred sixty-seven thousand, eight hundred fourteen".