202012100003221 has 4 divisors (see below), whose sum is σ = 202191030119500. Its totient is φ = 201833169886944.

The previous prime is 202012100003177. The next prime is 202012100003239. The reversal of 202012100003221 is 122300001210202.

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 45489831498225 + 156522268504996 = 6744615^2 + 12510886^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012100003221 - 2³³ = 202003510068629 is a prime.

It is a super-2 number, since 2×202012100003221² (a number of 29 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 = 202012100003195 and 202012100003204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202012100003251) 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, 89465056446 + ... + 89465058703.

It is an arithmetic number, because the mean of its divisors is an integer number (50547757529875).

Almost surely, 2^{202012100003221} is an apocalyptic number.

It is an amenable number.

202012100003221 is a deficient number, since it is larger than the sum of its proper divisors (178930116279).

202012100003221 is a wasteful number, since it uses less digits than its factorization.

202012100003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178930116278.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202012100003221 its reverse (122300001210202), we get a palindrome (324312101213423).

The spelling of 202012100003221 in words is "two hundred two trillion, twelve billion, one hundred million, three thousand, two hundred twenty-one".