211212121091 has 2 divisors, whose sum is σ = 211212121092. Its totient is φ = 211212121090.

The previous prime is 211212121073. The next prime is 211212121103. The reversal of 211212121091 is 190121212112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211212121091 is a prime.

It is a super-2 number, since 2×211212121091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211212121291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606060545 + 105606060546.

It is an arithmetic number, because the mean of its divisors is an integer number (105606060546).

Almost surely, 2^211212121091 is an apocalyptic number.

211212121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212121091 is an equidigital number, since it uses as much as digits as its factorization.

211212121091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211212121091 in words is "two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, ninety-one".