214259921691 has 4 divisors (see below), whose sum is σ = 285679895592. Its totient is φ = 142839947792.

The previous prime is 214259921633. The next prime is 214259921699. The reversal of 214259921691 is 196129952412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214259921691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (214259921699) 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, 35709986946 + ... + 35709986951.

It is an arithmetic number, because the mean of its divisors is an integer number (71419973898).

Almost surely, 2^214259921691 is an apocalyptic number.

214259921691 is a deficient number, since it is larger than the sum of its proper divisors (71419973901).

214259921691 is an equidigital number, since it uses as much as digits as its factorization.

214259921691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71419973900.

The product of its digits is 699840, while the sum is 51.

The spelling of 214259921691 in words is "two hundred fourteen billion, two hundred fifty-nine million, nine hundred twenty-one thousand, six hundred ninety-one".