211220121169 has 2 divisors, whose sum is σ = 211220121170. Its totient is φ = 211220121168.

The previous prime is 211220121109. The next prime is 211220121223. The reversal of 211220121169 is 961121022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210669984144 + 550137025 = 458988^2 + 23455^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220121169 - 2¹³ = 211220112977 is a prime.

It is a super-2 number, since 2×211220121169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220121109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610060584 + 105610060585.

It is an arithmetic number, because the mean of its divisors is an integer number (105610060585).

Almost surely, 2^211220121169 is an apocalyptic number.

It is an amenable number.

211220121169 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220121169 is an equidigital number, since it uses as much as digits as its factorization.

211220121169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 211220121169 in words is "two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, one hundred sixty-nine".