2111212221021 has 8 divisors (see below), whose sum is σ = 3127721808960. Its totient is φ = 1407474813996.

The previous prime is 2111212220993. The next prime is 2111212221113. The reversal of 2111212221021 is 1201222121112.

2111212221021 is a `hidden beast` number, since 211 + 1 + 212 + 221 + 0 + 21 = 666.

It is not a de Polignac number, because 2111212221021 - 2¹⁰ = 2111212219997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111212220985 and 2111212221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111212220021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39096522585 + ... + 39096522638.

It is an arithmetic number, because the mean of its divisors is an integer number (390965226120).

Almost surely, 2^{2111212221021} is an apocalyptic number.

It is an amenable number.

2111212221021 is a deficient number, since it is larger than the sum of its proper divisors (1016509587939).

2111212221021 is an equidigital number, since it uses as much as digits as its factorization.

2111212221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78193045232 (or 78193045226 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2111212221021 its reverse (1201222121112), we get a palindrome (3312434342133).

Subtracting from 2111212221021 its reverse (1201222121112), we obtain a palindrome (909990099909).

The spelling of 2111212221021 in words is "two trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".