221995012667 has 2 divisors, whose sum is σ = 221995012668. Its totient is φ = 221995012666.

The previous prime is 221995012663. The next prime is 221995012693. The reversal of 221995012667 is 766210599122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221995012667 - 2² = 221995012663 is a prime.

It is not a weakly prime, because it can be changed into another prime (221995012663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110997506333 + 110997506334.

It is an arithmetic number, because the mean of its divisors is an integer number (110997506334).

Almost surely, 2^221995012667 is an apocalyptic number.

221995012667 is a deficient number, since it is larger than the sum of its proper divisors (1).

221995012667 is an equidigital number, since it uses as much as digits as its factorization.

221995012667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 221995012667 in words is "two hundred twenty-one billion, nine hundred ninety-five million, twelve thousand, six hundred sixty-seven".