211210121122157 has 2 divisors, whose sum is σ = 211210121122158. Its totient is φ = 211210121122156.

The previous prime is 211210121122103. The next prime is 211210121122267. The reversal of 211210121122157 is 751221121012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210949887484996 + 260233637161 = 14524114^2 + 510131^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210121122157 - 2⁴⁶ = 140841376944493 is a prime.

It is a super-3 number, since 3×211210121122157³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210121142157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605060561078 + 105605060561079.

It is an arithmetic number, because the mean of its divisors is an integer number (105605060561079).

Almost surely, 2^{211210121122157} is an apocalyptic number.

It is an amenable number.

211210121122157 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210121122157 is an equidigital number, since it uses as much as digits as its factorization.

211210121122157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 29.

Adding to 211210121122157 its reverse (751221121012112), we get a palindrome (962431242134269).

The spelling of 211210121122157 in words is "two hundred eleven trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred fifty-seven".