22220222121991 has 2 divisors, whose sum is σ = 22220222121992. Its totient is φ = 22220222121990.

The previous prime is 22220222121949. The next prime is 22220222122039. The reversal of 22220222121991 is 19912122202222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22220222121991 - 2¹¹ = 22220222119943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22220222121991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22220222121091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110111060995 + 11110111060996.

It is an arithmetic number, because the mean of its divisors is an integer number (11110111060996).

Almost surely, 2^{22220222121991} is an apocalyptic number.

22220222121991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220222121991 is an equidigital number, since it uses as much as digits as its factorization.

22220222121991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 22220222121991 in words is "twenty-two trillion, two hundred twenty billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-one".