2111221212021 has 16 divisors (see below), whose sum is σ = 3235588065600. Its totient is φ = 1358946986544.

The previous prime is 2111221212011. The next prime is 2111221212049. The reversal of 2111221212021 is 1202121221112.

2111221212021 is a `hidden beast` number, since 211 + 1 + 221 + 212 + 0 + 21 = 666.

It is not a de Polignac number, because 2111221212021 - 2¹⁴ = 2111221195637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111221211985 and 2111221212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111221212011) 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, 1348160911 + ... + 1348162476.

It is an arithmetic number, because the mean of its divisors is an integer number (202224254100).

Almost surely, 2^{2111221212021} is an apocalyptic number.

It is an amenable number.

2111221212021 is a deficient number, since it is larger than the sum of its proper divisors (1124366853579).

2111221212021 is a wasteful number, since it uses less digits than its factorization.

2111221212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696323425 (or 2696323419 counting only the distinct ones).

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

Adding to 2111221212021 its reverse (1202121221112), we get a palindrome (3313342433133).

Subtracting from 2111221212021 its reverse (1202121221112), we obtain a palindrome (909099990909).

The spelling of 2111221212021 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".