20210101022221 has 32 divisors (see below), whose sum is σ = 23036271436800. Its totient is φ = 17561490240000.

The previous prime is 20210101022219. The next prime is 20210101022227. The reversal of 20210101022221 is 12222010101202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20210101022221 - 2¹ = 20210101022219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210101022195 and 20210101022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210101022227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299957425 + ... + 300024793.

It is an arithmetic number, because the mean of its divisors is an integer number (719883482400).

Almost surely, 2^{20210101022221} is an apocalyptic number.

It is an amenable number.

20210101022221 is a deficient number, since it is larger than the sum of its proper divisors (2826170414579).

20210101022221 is a wasteful number, since it uses less digits than its factorization.

20210101022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76821.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20210101022221 its reverse (12222010101202), we get a palindrome (32432111123423).

The spelling of 20210101022221 in words is "twenty trillion, two hundred ten billion, one hundred one million, twenty-two thousand, two hundred twenty-one".