222212121251 has 2 divisors, whose sum is σ = 222212121252. Its totient is φ = 222212121250.

The previous prime is 222212121193. The next prime is 222212121281. The reversal of 222212121251 is 152121212222.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222212121251 is a prime.

It is not a weakly prime, because it can be changed into another prime (222212121281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111106060625 + 111106060626.

It is an arithmetic number, because the mean of its divisors is an integer number (111106060626).

Almost surely, 2^222212121251 is an apocalyptic number.

222212121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

222212121251 is an equidigital number, since it uses as much as digits as its factorization.

222212121251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

Adding to 222212121251 its reverse (152121212222), we get a palindrome (374333333473).

The spelling of 222212121251 in words is "two hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred fifty-one".