211220102010221 has 2 divisors, whose sum is σ = 211220102010222. Its totient is φ = 211220102010220.

The previous prime is 211220102010163. The next prime is 211220102010227. The reversal of 211220102010221 is 122010201022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210565086961321 + 655015048900 = 14510861^2 + 809330^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220102010221 - 2¹⁴ = 211220101993837 is a prime.

It is a super-2 number, since 2×211220102010221² (a number of 29 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 211220102010221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220102010227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610051005110 + 105610051005111.

It is an arithmetic number, because the mean of its divisors is an integer number (105610051005111).

Almost surely, 2^{211220102010221} is an apocalyptic number.

It is an amenable number.

211220102010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220102010221 is an equidigital number, since it uses as much as digits as its factorization.

211220102010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211220102010221 its reverse (122010201022112), we get a palindrome (333230303032333).

The spelling of 211220102010221 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred two million, ten thousand, two hundred twenty-one".