2021022121211 has 4 divisors (see below), whose sum is σ = 2029074002424. Its totient is φ = 2012970240000.

The previous prime is 2021022121193. The next prime is 2021022121231. The reversal of 2021022121211 is 1121212201202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021022121211 is a prime.

It is a super-2 number, since 2×2021022121211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021022121211.

It is not an unprimeable number, because it can be changed into a prime (2021022121231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4025940230 + ... + 4025940731.

It is an arithmetic number, because the mean of its divisors is an integer number (507268500606).

Almost surely, 2^{2021022121211} is an apocalyptic number.

2021022121211 is a deficient number, since it is larger than the sum of its proper divisors (8051881213).

2021022121211 is an equidigital number, since it uses as much as digits as its factorization.

2021022121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8051881212.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2021022121211 its reverse (1121212201202), we get a palindrome (3142234322413).

The spelling of 2021022121211 in words is "two trillion, twenty-one billion, twenty-two million, one hundred twenty-one thousand, two hundred eleven".