20311221321100 has 72 divisors (see below), whose sum is σ = 44796829381920. Its totient is φ = 7992423774720.

The previous prime is 20311221321091. The next prime is 20311221321137. The reversal of 20311221321100 is 112312211302.

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, 4038984 + ... + 7545583.

It is an arithmetic number, because the mean of its divisors is an integer number (622178185860).

Almost surely, 2^{20311221321100} is an apocalyptic number.

20311221321100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311221321100 is an abundant number, since it is smaller than the sum of its proper divisors (24485608060820).

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

20311221321100 is a wasteful number, since it uses less digits than its factorization.

20311221321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11584867 (or 11584860 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20311221321100 its reverse (112312211302), we get a palindrome (20423533532402).

The spelling of 20311221321100 in words is "twenty trillion, three hundred eleven billion, two hundred twenty-one million, three hundred twenty-one thousand, one hundred".