20021121200 has 60 divisors (see below), whose sum is σ = 48120037680. Its totient is φ = 8005236480.

The previous prime is 20021121193. The next prime is 20021121217. The reversal of 20021121200 is 212112002.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1158221 + ... + 1175379.

It is an arithmetic number, because the mean of its divisors is an integer number (802000628).

Almost surely, 2^20021121200 is an apocalyptic number.

20021121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021121200 is an abundant number, since it is smaller than the sum of its proper divisors (28098916480).

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

20021121200 is a wasteful number, since it uses less digits than its factorization.

20021121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20094 (or 20083 counting only the distinct ones).

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

Adding to 20021121200 its reverse (212112002), we get a palindrome (20233233202).

The spelling of 20021121200 in words is "twenty billion, twenty-one million, one hundred twenty-one thousand, two hundred".