200121002109 has 32 divisors (see below), whose sum is σ = 338970516480. Its totient is φ = 114307167600.

The previous prime is 200121002087. The next prime is 200121002129. The reversal of 200121002109 is 901200121002.

It is not a de Polignac number, because 200121002109 - 2⁵ = 200121002077 is a prime.

It is a super-2 number, since 2×200121002109² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 200121002091 and 200121002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121002129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236094 + ... + 675264.

It is an arithmetic number, because the mean of its divisors is an integer number (10592828640).

Almost surely, 2^200121002109 is an apocalyptic number.

It is an amenable number.

200121002109 is a deficient number, since it is larger than the sum of its proper divisors (138849514371).

200121002109 is a wasteful number, since it uses less digits than its factorization.

200121002109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441598 (or 441592 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

It can be divided in two parts, 20012 and 1002109, that added together give a square (1022121 = 1011²).

The spelling of 200121002109 in words is "two hundred billion, one hundred twenty-one million, two thousand, one hundred nine".