2021211111221 has 16 divisors (see below), whose sum is σ = 2085283038720. Its totient is φ = 1957866785280.

The previous prime is 2021211111133. The next prime is 2021211111239. The reversal of 2021211111221 is 1221111121202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021211111221 is a prime.

It is a super-2 number, since 2×2021211111221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2021211111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021211111281) 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, 6593276 + ... + 6893018.

It is an arithmetic number, because the mean of its divisors is an integer number (130330189920).

Almost surely, 2^{2021211111221} is an apocalyptic number.

It is an amenable number.

2021211111221 is a deficient number, since it is larger than the sum of its proper divisors (64071927499).

2021211111221 is a wasteful number, since it uses less digits than its factorization.

2021211111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300956.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2021211111221 its reverse (1221111121202), we get a palindrome (3242322232423).

The spelling of 2021211111221 in words is "two trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-one".