2000100021221 has 4 divisors (see below), whose sum is σ = 2069068987500. Its totient is φ = 1931131054944.

The previous prime is 2000100021169. The next prime is 2000100021233. The reversal of 2000100021221 is 1221200010002.

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 1076377200196 + 923722821025 = 1037486^2 + 961105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2000100021221 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 (2000100021251) 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, 34484483096 + ... + 34484483153.

It is an arithmetic number, because the mean of its divisors is an integer number (517267246875).

Almost surely, 2^{2000100021221} is an apocalyptic number.

It is an amenable number.

2000100021221 is a deficient number, since it is larger than the sum of its proper divisors (68968966279).

2000100021221 is an equidigital number, since it uses as much as digits as its factorization.

2000100021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68968966278.

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

Adding to 2000100021221 its reverse (1221200010002), we get a palindrome (3221300031223).

It can be divided in two parts, 200010002 and 1221, that multiplied together give a palindrome (244212212442).

The spelling of 2000100021221 in words is "two trillion, one hundred million, twenty-one thousand, two hundred twenty-one".