200122021 has 6 divisors (see below), whose sum is σ = 219968966. Its totient is φ = 181929000.

The previous prime is 200121991. The next prime is 200122031. The reversal of 200122021 is 120221002.

It can be written as a sum of positive squares in only one way, i.e., 166771396 + 33350625 = 12914^2 + 5775^2 .

It is not a de Polignac number, because 200122021 - 2⁵ = 200121989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121989 and 200122007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200122031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 826830 + ... + 827071.

Almost surely, 2^200122021 is an apocalyptic number.

It is an amenable number.

200122021 is a deficient number, since it is larger than the sum of its proper divisors (19846945).

200122021 is a wasteful number, since it uses less digits than its factorization.

200122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653923 (or 1653912 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 200122021 is about 14146.4490597464. The cubic root of 200122021 is about 584.9224539869.

Adding to 200122021 its reverse (120221002), we get a palindrome (320343023).

It can be divided in two parts, 200 and 122021, that added together give a palindrome (122221).

The spelling of 200122021 in words is "two hundred million, one hundred twenty-two thousand, twenty-one".