211122001021 has 2 divisors, whose sum is σ = 211122001022. Its totient is φ = 211122001020.

The previous prime is 211122001003. The next prime is 211122001039. The reversal of 211122001021 is 120100221112.

It is a balanced prime because it is at equal distance from previous prime (211122001003) and next prime (211122001039).

It can be written as a sum of positive squares in only one way, i.e., 151285992025 + 59836008996 = 388955^2 + 244614^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122001021 - 2⁵ = 211122000989 is a prime.

It is a super-2 number, since 2×211122001021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211122000992 and 211122001010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211122001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561000510 + 105561000511.

It is an arithmetic number, because the mean of its divisors is an integer number (105561000511).

Almost surely, 2^211122001021 is an apocalyptic number.

It is an amenable number.

211122001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122001021 is an equidigital number, since it uses as much as digits as its factorization.

211122001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211122001021 its reverse (120100221112), we get a palindrome (331222222133).

The spelling of 211122001021 in words is "two hundred eleven billion, one hundred twenty-two million, one thousand, twenty-one".