22101213257 has 2 divisors, whose sum is σ = 22101213258. Its totient is φ = 22101213256.

The previous prime is 22101213209. The next prime is 22101213283. The reversal of 22101213257 is 75231210122.

It is an a-pointer prime, because the next prime (22101213283) can be obtained adding 22101213257 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21569034496 + 532178761 = 146864^2 + 23069^2 .

It is a cyclic number.

It is not a de Polignac number, because 22101213257 - 2¹⁸ = 22100951113 is a prime.

It is not a weakly prime, because it can be changed into another prime (22101213457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050606628 + 11050606629.

It is an arithmetic number, because the mean of its divisors is an integer number (11050606629).

Almost surely, 2^22101213257 is an apocalyptic number.

It is an amenable number.

22101213257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22101213257 is an equidigital number, since it uses as much as digits as its factorization.

22101213257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 22101213257 its reverse (75231210122), we get a palindrome (97332423379).

The spelling of 22101213257 in words is "twenty-two billion, one hundred one million, two hundred thirteen thousand, two hundred fifty-seven".