20102000211221 has 4 divisors (see below), whose sum is σ = 20102379683244. Its totient is φ = 20101620739200.

The previous prime is 20102000211199. The next prime is 20102000211229. The reversal of 20102000211221 is 12211200020102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17595759772900 + 2506240438321 = 4194730^2 + 1583111^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102000211221 - 2³⁰ = 20100926469397 is a prime.

It is a super-2 number, since 2×20102000211221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102000211196 and 20102000211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102000211229) 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, 189656540 + ... + 189762501.

It is an arithmetic number, because the mean of its divisors is an integer number (5025594920811).

Almost surely, 2^{20102000211221} is an apocalyptic number.

It is an amenable number.

20102000211221 is a deficient number, since it is larger than the sum of its proper divisors (379472023).

20102000211221 is an equidigital number, since it uses as much as digits as its factorization.

20102000211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379472022.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20102000211221 its reverse (12211200020102), we get a palindrome (32313200231323).

The spelling of 20102000211221 in words is "twenty trillion, one hundred two billion, two hundred eleven thousand, two hundred twenty-one".