211121020157 has 2 divisors, whose sum is σ = 211121020158. Its totient is φ = 211121020156.

The previous prime is 211121020109. The next prime is 211121020213. The reversal of 211121020157 is 751020121112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152391859876 + 58729160281 = 390374^2 + 242341^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121020157 - 2¹² = 211121016061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121020757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560510078 + 105560510079.

It is an arithmetic number, because the mean of its divisors is an integer number (105560510079).

Almost surely, 2^211121020157 is an apocalyptic number.

It is an amenable number.

211121020157 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121020157 is an equidigital number, since it uses as much as digits as its factorization.

211121020157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 211121020157 its reverse (751020121112), we get a palindrome (962141141269).

The spelling of 211121020157 in words is "two hundred eleven billion, one hundred twenty-one million, twenty thousand, one hundred fifty-seven".