211220110111021 has 16 divisors (see below), whose sum is σ = 232713913094208. Its totient is φ = 190108475632000.

The previous prime is 211220110110943. The next prime is 211220110111063. The reversal of 211220110111021 is 120111011022112.

It is a cyclic number.

It is not a de Polignac number, because 211220110111021 - 2²⁷ = 211219975893293 is a prime.

It is a super-2 number, since 2×211220110111021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220110110986 and 211220110111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220110111091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20216550 + ... + 28829656.

It is an arithmetic number, because the mean of its divisors is an integer number (14544619568388).

Almost surely, 2^{211220110111021} is an apocalyptic number.

It is an amenable number.

211220110111021 is a deficient number, since it is larger than the sum of its proper divisors (21493802983187).

211220110111021 is a wasteful number, since it uses less digits than its factorization.

211220110111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8635292.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 211220110111021 its reverse (120111011022112), we get a palindrome (331331121133133).

The spelling of 211220110111021 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred ten million, one hundred eleven thousand, twenty-one".