200012100021 has 12 divisors (see below), whose sum is σ = 296714647372. Its totient is φ = 129737578176.

The previous prime is 200012100019. The next prime is 200012100031. The reversal of 200012100021 is 120001210002.

It can be written as a sum of positive squares in 2 ways, for example, as 183367229796 + 16644870225 = 428214^2 + 129015^2 .

It is not a de Polignac number, because 200012100021 - 2¹ = 200012100019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200012099976 and 200012100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200012100031) 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, 300318136 + ... + 300318801.

Almost surely, 2^200012100021 is an apocalyptic number.

It is an amenable number.

200012100021 is a deficient number, since it is larger than the sum of its proper divisors (96702547351).

200012100021 is a wasteful number, since it uses less digits than its factorization.

200012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600636980 (or 600636977 counting only the distinct ones).

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

Adding to 200012100021 its reverse (120001210002), we get a palindrome (320013310023).

The spelling of 200012100021 in words is "two hundred billion, twelve million, one hundred thousand, twenty-one".