20102121200 has 120 divisors (see below), whose sum is σ = 55439582592. Its totient is φ = 6861576960.

The previous prime is 20102121181. The next prime is 20102121227. The reversal of 20102121200 is 212120102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 619787 + ... + 651413.

Almost surely, 2^20102121200 is an apocalyptic number.

20102121200 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 20102121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27719791296).

20102121200 is an abundant number, since it is smaller than the sum of its proper divisors (35337461392).

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

20102121200 is a wasteful number, since it uses less digits than its factorization.

20102121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31879 (or 31868 counting only the distinct ones).

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

Adding to 20102121200 its reverse (212120102), we get a palindrome (20314241302).

The spelling of 20102121200 in words is "twenty billion, one hundred two million, one hundred twenty-one thousand, two hundred".