221151694919 has 2 divisors, whose sum is σ = 221151694920. Its totient is φ = 221151694918.

The previous prime is 221151694903. The next prime is 221151694991. The reversal of 221151694919 is 919496151122.

Together with next prime (221151694991) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221151694919 - 2⁴ = 221151694903 is a prime.

It is a super-2 number, since 2×221151694919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221151624919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110575847459 + 110575847460.

It is an arithmetic number, because the mean of its divisors is an integer number (110575847460).

Almost surely, 2^221151694919 is an apocalyptic number.

221151694919 is a deficient number, since it is larger than the sum of its proper divisors (1).

221151694919 is an equidigital number, since it uses as much as digits as its factorization.

221151694919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The spelling of 221151694919 in words is "two hundred twenty-one billion, one hundred fifty-one million, six hundred ninety-four thousand, nine hundred nineteen".