20310221321221 has 4 divisors (see below), whose sum is σ = 21872546038252. Its totient is φ = 18747896604192.

The previous prime is 20310221321209. The next prime is 20310221321293. The reversal of 20310221321221 is 12212312201302.

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 12501605849121 + 7808615472100 = 3535761^2 + 2794390^2 .

It is a cyclic number.

It is not a de Polignac number, because 20310221321221 - 2⁵ = 20310221321189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20310221321192 and 20310221321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310221421221) 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, 781162358496 + ... + 781162358521.

It is an arithmetic number, because the mean of its divisors is an integer number (5468136509563).

Almost surely, 2^{20310221321221} is an apocalyptic number.

It is an amenable number.

20310221321221 is a deficient number, since it is larger than the sum of its proper divisors (1562324717031).

20310221321221 is a wasteful number, since it uses less digits than its factorization.

20310221321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562324717030.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20310221321221 its reverse (12212312201302), we get a palindrome (32522533522523).

The spelling of 20310221321221 in words is "twenty trillion, three hundred ten billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".