2010000021221 has 4 divisors (see below), whose sum is σ = 2020203067212. Its totient is φ = 1999796975232.

The previous prime is 2010000021157. The next prime is 2010000021229. The reversal of 2010000021221 is 1221200000102.

It is a happy number.

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 912196908100 + 1097803113121 = 955090^2 + 1047761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2010000021221 - 2⁶ = 2010000021157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2010000021229) 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, 5101522700 + ... + 5101523093.

It is an arithmetic number, because the mean of its divisors is an integer number (505050766803).

Almost surely, 2^{2010000021221} is an apocalyptic number.

It is an amenable number.

2010000021221 is a deficient number, since it is larger than the sum of its proper divisors (10203045991).

2010000021221 is a wasteful number, since it uses less digits than its factorization.

2010000021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203045990.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2010000021221 its reverse (1221200000102), we get a palindrome (3231200021323).

The spelling of 2010000021221 in words is "two trillion, ten billion, twenty-one thousand, two hundred twenty-one".