211221111253 has 2 divisors, whose sum is σ = 211221111254. Its totient is φ = 211221111252.

The previous prime is 211221111217. The next prime is 211221111263. The reversal of 211221111253 is 352111122112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131164935889 + 80056175364 = 362167^2 + 282942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221111253 is a prime.

It is a super-2 number, since 2×211221111253² (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 (211221111263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610555626 + 105610555627.

It is an arithmetic number, because the mean of its divisors is an integer number (105610555627).

Almost surely, 2^211221111253 is an apocalyptic number.

It is an amenable number.

211221111253 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221111253 is an equidigital number, since it uses as much as digits as its factorization.

211221111253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

Adding to 211221111253 its reverse (352111122112), we get a palindrome (563332233365).

The spelling of 211221111253 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, two hundred fifty-three".