200121200020 has 96 divisors (see below), whose sum is σ = 506136024576. Its totient is φ = 64979904000.

The previous prime is 200121200017. The next prime is 200121200051. The reversal of 200121200020 is 20002121002.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17550 + ... + 632890.

It is an arithmetic number, because the mean of its divisors is an integer number (5272250256).

Almost surely, 2^200121200020 is an apocalyptic number.

200121200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 200121200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253068012288).

200121200020 is an abundant number, since it is smaller than the sum of its proper divisors (306014824556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

200121200020 is a wasteful number, since it uses less digits than its factorization.

200121200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615481 (or 615479 counting only the distinct ones).

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

Adding to 200121200020 its reverse (20002121002), we get a palindrome (220123321022).

The spelling of 200121200020 in words is "two hundred billion, one hundred twenty-one million, two hundred thousand, twenty".