2021210101221 has 16 divisors (see below), whose sum is σ = 2780194819584. Its totient is φ = 1305176013504.

The previous prime is 2021210101217. The next prime is 2021210101243. The reversal of 2021210101221 is 1221010121202.

It is not a de Polignac number, because 2021210101221 - 2² = 2021210101217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021210101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021210101321) 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, 40802826 + ... + 40852331.

It is an arithmetic number, because the mean of its divisors is an integer number (173762176224).

Almost surely, 2^{2021210101221} is an apocalyptic number.

It is an amenable number.

2021210101221 is a deficient number, since it is larger than the sum of its proper divisors (758984718363).

2021210101221 is a wasteful number, since it uses less digits than its factorization.

2021210101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81655420.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021210101221 its reverse (1221010121202), we get a palindrome (3242220222423).

The spelling of 2021210101221 in words is "two trillion, twenty-one billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".