211102001221 has 2 divisors, whose sum is σ = 211102001222. Its totient is φ = 211102001220.

The previous prime is 211102001213. The next prime is 211102001251. The reversal of 211102001221 is 122100201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205000672900 + 6101328321 = 452770^2 + 78111^2 .

It is a cyclic number.

It is not a de Polignac number, because 211102001221 - 2³ = 211102001213 is a prime.

It is a super-2 number, since 2×211102001221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211102001251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105551000610 + 105551000611.

It is an arithmetic number, because the mean of its divisors is an integer number (105551000611).

Almost surely, 2^211102001221 is an apocalyptic number.

It is an amenable number.

211102001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211102001221 is an equidigital number, since it uses as much as digits as its factorization.

211102001221 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 211102001221 its reverse (122100201112), we get a palindrome (333202202333).

The spelling of 211102001221 in words is "two hundred eleven billion, one hundred two million, one thousand, two hundred twenty-one".