211220103221 has 2 divisors, whose sum is σ = 211220103222. Its totient is φ = 211220103220.

The previous prime is 211220103217. The next prime is 211220103233. The reversal of 211220103221 is 122301022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107462674225 + 103757428996 = 327815^2 + 322114^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220103221 - 2² = 211220103217 is a prime.

It is a super-2 number, since 2×211220103221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211220103221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220103271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610051610 + 105610051611.

It is an arithmetic number, because the mean of its divisors is an integer number (105610051611).

Almost surely, 2^211220103221 is an apocalyptic number.

It is an amenable number.

211220103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220103221 is an equidigital number, since it uses as much as digits as its factorization.

211220103221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211220103221 its reverse (122301022112), we get a palindrome (333521125333).

The spelling of 211220103221 in words is "two hundred eleven billion, two hundred twenty million, one hundred three thousand, two hundred twenty-one".