211221022222157 has 2 divisors, whose sum is σ = 211221022222158. Its totient is φ = 211221022222156.

The previous prime is 211221022222123. The next prime is 211221022222253. The reversal of 211221022222157 is 751222220122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147452716146121 + 63768306076036 = 12143011^2 + 7985506^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221022222157 - 2²² = 211221018027853 is a prime.

It is a super-2 number, since 2×211221022222157² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221022222057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610511111078 + 105610511111079.

It is an arithmetic number, because the mean of its divisors is an integer number (105610511111079).

Almost surely, 2^{211221022222157} is an apocalyptic number.

It is an amenable number.

211221022222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221022222157 is an equidigital number, since it uses as much as digits as its factorization.

211221022222157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 32.

Adding to 211221022222157 its reverse (751222220122112), we get a palindrome (962443242344269).

The spelling of 211221022222157 in words is "two hundred eleven trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty-two thousand, one hundred fifty-seven".