2111212021 has 12 divisors (see below), whose sum is σ = 2212265440. Its totient is φ = 2014598520.

The previous prime is 2111211983. The next prime is 2111212043. The reversal of 2111212021 is 1202121112.

It is not a de Polignac number, because 2111212021 - 2¹⁷ = 2111080949 is a prime.

It is a super-2 number, since 2×2111212021² = 8914432395229808882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111211992 and 2111212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111212091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227686 + ... + 236776.

Almost surely, 2^2111212021 is an apocalyptic number.

It is an amenable number.

2111212021 is a deficient number, since it is larger than the sum of its proper divisors (101053419).

2111212021 is an equidigital number, since it uses as much as digits as its factorization.

2111212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576 (or 9553 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2111212021 is about 45947.9272764289. The cubic root of 2111212021 is about 1282.8541496695.

Adding to 2111212021 its reverse (1202121112), we get a palindrome (3313333133).

Subtracting from 2111212021 its reverse (1202121112), we obtain a palindrome (909090909).

It can be divided in two parts, 21112 and 12021, that multiplied together give a palindrome (253787352).

The spelling of 2111212021 in words is "two billion, one hundred eleven million, two hundred twelve thousand, twenty-one".