200020021000121 has 32 divisors (see below), whose sum is σ = 234127237344000. Its totient is φ = 167343692414976.

The previous prime is 200020021000073. The next prime is 200020021000139. The reversal of 200020021000121 is 121000120020002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-200020021000121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (200020021000181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182664755 + ... + 183756503.

It is an arithmetic number, because the mean of its divisors is an integer number (7316476167000).

Almost surely, 2^{200020021000121} is an apocalyptic number.

It is an amenable number.

200020021000121 is a deficient number, since it is larger than the sum of its proper divisors (34107216343879).

200020021000121 is a wasteful number, since it uses less digits than its factorization.

200020021000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095393.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200020021000121 its reverse (121000120020002), we get a palindrome (321020141020123).

The spelling of 200020021000121 in words is "two hundred trillion, twenty billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.