2021310221221 has 16 divisors (see below), whose sum is σ = 2075784036480. Its totient is φ = 1967178467520.

The previous prime is 2021310221171. The next prime is 2021310221237. The reversal of 2021310221221 is 1221220131202.

It is a cyclic number.

It is not a de Polignac number, because 2021310221221 - 2³⁷ = 1883871267749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021310222221) 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, 80482456 + ... + 80507566.

It is an arithmetic number, because the mean of its divisors is an integer number (129736502280).

Almost surely, 2^{2021310221221} is an apocalyptic number.

It is an amenable number.

2021310221221 is a deficient number, since it is larger than the sum of its proper divisors (54473815259).

2021310221221 is a wasteful number, since it uses less digits than its factorization.

2021310221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31836.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2021310221221 its reverse (1221220131202), we get a palindrome (3242530352423).

The spelling of 2021310221221 in words is "two trillion, twenty-one billion, three hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".