20121001121100 has 144 divisors (see below), whose sum is σ = 66270465918720. Its totient is φ = 4665739372800.

The previous prime is 20121001121099. The next prime is 20121001121101. The reversal of 20121001121100 is 112110012102.

It is an interprime number because it is at equal distance from previous prime (20121001121099) and next prime (20121001121101).

It is a super-2 number, since 2×20121001121100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20121001121101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132473515 + ... + 132625314.

It is an arithmetic number, because the mean of its divisors is an integer number (460211568880).

Almost surely, 2^{20121001121100} is an apocalyptic number.

20121001121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121001121100 is an abundant number, since it is smaller than the sum of its proper divisors (46149464797620).

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

20121001121100 is a wasteful number, since it uses less digits than its factorization.

20121001121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265098880 (or 265098873 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121001121100 its reverse (112110012102), we get a palindrome (20233111133202).

The spelling of 20121001121100 in words is "twenty trillion, one hundred twenty-one billion, one million, one hundred twenty-one thousand, one hundred".