2221211202157 has 2 divisors, whose sum is σ = 2221211202158. Its totient is φ = 2221211202156.

The previous prime is 2221211202137. The next prime is 2221211202163. The reversal of 2221211202157 is 7512021121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1748876647401 + 472334554756 = 1322451^2 + 687266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221211202157 - 2²³ = 2221202813549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221211202137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110605601078 + 1110605601079.

It is an arithmetic number, because the mean of its divisors is an integer number (1110605601079).

Almost surely, 2^{2221211202157} is an apocalyptic number.

It is an amenable number.

2221211202157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221211202157 is an equidigital number, since it uses as much as digits as its factorization.

2221211202157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 2221211202157 its reverse (7512021121222), we get a palindrome (9733232323379).

The spelling of 2221211202157 in words is "two trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred fifty-seven".