20100301121221 has 4 divisors (see below), whose sum is σ = 20102384279500. Its totient is φ = 20098217962944.

The previous prime is 20100301121177. The next prime is 20100301121231. The reversal of 20100301121221 is 12212110300102.

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 1219668436996 + 18880632684225 = 1104386^2 + 4345185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100301121221 - 2⁷ = 20100301121093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100301121195 and 20100301121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100301121231) 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, 1041564666 + ... + 1041583963.

It is an arithmetic number, because the mean of its divisors is an integer number (5025596069875).

Almost surely, 2^{20100301121221} is an apocalyptic number.

It is an amenable number.

20100301121221 is a deficient number, since it is larger than the sum of its proper divisors (2083158279).

20100301121221 is an equidigital number, since it uses as much as digits as its factorization.

20100301121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083158278.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20100301121221 its reverse (12212110300102), we get a palindrome (32312411421323).

The spelling of 20100301121221 in words is "twenty trillion, one hundred billion, three hundred one million, one hundred twenty-one thousand, two hundred twenty-one".