22021222021991 has 2 divisors, whose sum is σ = 22021222021992. Its totient is φ = 22021222021990.

The previous prime is 22021222021963. The next prime is 22021222022003. The reversal of 22021222021991 is 19912022212022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22021222021991 - 2⁶ = 22021222021927 is a prime.

It is a super-4 number, since 4×22021222021991⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021222023991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010611010995 + 11010611010996.

It is an arithmetic number, because the mean of its divisors is an integer number (11010611010996).

Almost surely, 2^{22021222021991} is an apocalyptic number.

22021222021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021222021991 is an equidigital number, since it uses as much as digits as its factorization.

22021222021991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 22021222021991 in words is "twenty-two trillion, twenty-one billion, two hundred twenty-two million, twenty-one thousand, nine hundred ninety-one".