200021121 has 12 divisors (see below), whose sum is σ = 290434560. Its totient is φ = 132648120.

The previous prime is 200021117. The next prime is 200021123. The reversal of 200021121 is 121120002.

It is not a de Polignac number, because 200021121 - 2² = 200021117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (200021123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56461 + ... + 59898.

It is an arithmetic number, because the mean of its divisors is an integer number (24202880).

Almost surely, 2^200021121 is an apocalyptic number.

It is an amenable number.

200021121 is a deficient number, since it is larger than the sum of its proper divisors (90413439).

200021121 is a wasteful number, since it uses less digits than its factorization.

200021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116556 (or 116553 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 200021121 is about 14142.8823441334. The cubic root of 200021121 is about 584.8241329775.

Adding to 200021121 its reverse (121120002), we get a palindrome (321141123).

The spelling of 200021121 in words is "two hundred million, twenty-one thousand, one hundred twenty-one".