200122201021 has 4 divisors (see below), whose sum is σ = 200124069372. Its totient is φ = 200120332672.

The previous prime is 200122201007. The next prime is 200122201033. The reversal of 200122201021 is 120102221002.

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 23941372900 + 176180828121 = 154730^2 + 419739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200122201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200122200992 and 200122201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200122201061) 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, 763060 + ... + 991213.

It is an arithmetic number, because the mean of its divisors is an integer number (50031017343).

Almost surely, 2^200122201021 is an apocalyptic number.

It is an amenable number.

200122201021 is a deficient number, since it is larger than the sum of its proper divisors (1868351).

200122201021 is a wasteful number, since it uses less digits than its factorization.

200122201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868350.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 200122201021 its reverse (120102221002), we get a palindrome (320224422023).

The spelling of 200122201021 in words is "two hundred billion, one hundred twenty-two million, two hundred one thousand, twenty-one".