200122010021 has 4 divisors (see below), whose sum is σ = 200326844172. Its totient is φ = 199917175872.

The previous prime is 200122010003. The next prime is 200122010089. The reversal of 200122010021 is 120010221002.

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 104261181025 + 95860828996 = 322895^2 + 309614^2 .

It is a cyclic number.

It is not a de Polignac number, because 200122010021 - 2¹⁰ = 200122008997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200122009984 and 200122010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200122010321) 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, 102415610 + ... + 102417563.

It is an arithmetic number, because the mean of its divisors is an integer number (50081711043).

Almost surely, 2^200122010021 is an apocalyptic number.

It is an amenable number.

200122010021 is a deficient number, since it is larger than the sum of its proper divisors (204834151).

200122010021 is an equidigital number, since it uses as much as digits as its factorization.

200122010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204834150.

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

Adding to 200122010021 its reverse (120010221002), we get a palindrome (320132231023).

It can be divided in two parts, 200 and 122010021, that added together give a palindrome (122010221).

The spelling of 200122010021 in words is "two hundred billion, one hundred twenty-two million, ten thousand, twenty-one".