221220222202891 has 2 divisors, whose sum is σ = 221220222202892. Its totient is φ = 221220222202890.

The previous prime is 221220222202787. The next prime is 221220222202901. The reversal of 221220222202891 is 198202222022122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220222202891 is a prime.

It is a super-2 number, since 2×221220222202891² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221220222202891.

It is not a weakly prime, because it can be changed into another prime (221220222242891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610111101445 + 110610111101446.

It is an arithmetic number, because the mean of its divisors is an integer number (110610111101446).

Almost surely, 2^{221220222202891} is an apocalyptic number.

221220222202891 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220222202891 is an equidigital number, since it uses as much as digits as its factorization.

221220222202891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 221220222202891 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred two thousand, eight hundred ninety-one".