22145239997 has 2 divisors, whose sum is σ = 22145239998. Its totient is φ = 22145239996.

The previous prime is 22145239957. The next prime is 22145239999. The reversal of 22145239997 is 79993254122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21641057881 + 504182116 = 147109^2 + 22454^2 .

It is a cyclic number.

It is not a de Polignac number, because 22145239997 - 2⁶ = 22145239933 is a prime.

Together with 22145239999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22145239999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11072619998 + 11072619999.

It is an arithmetic number, because the mean of its divisors is an integer number (11072619999).

Almost surely, 2^22145239997 is an apocalyptic number.

It is an amenable number.

22145239997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22145239997 is an equidigital number, since it uses as much as digits as its factorization.

22145239997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The spelling of 22145239997 in words is "twenty-two billion, one hundred forty-five million, two hundred thirty-nine thousand, nine hundred ninety-seven".