20011021121100 has 36 divisors (see below), whose sum is σ = 57898554444584. Its totient is φ = 5336272298880.

The previous prime is 20011021121029. The next prime is 20011021121137. The reversal of 20011021121100 is 112112011002.

It is a super-2 number, since 2×20011021121100² (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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33351701569 + ... + 33351702168.

Almost surely, 2^{20011021121100} is an apocalyptic number.

20011021121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011021121100 is an abundant number, since it is smaller than the sum of its proper divisors (37887533323484).

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

20011021121100 is a wasteful number, since it uses less digits than its factorization.

20011021121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66703403754 (or 66703403747 counting only the distinct ones).

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

Adding to 20011021121100 its reverse (112112011002), we get a palindrome (20123133132102).

The spelling of 20011021121100 in words is "twenty trillion, eleven billion, twenty-one million, one hundred twenty-one thousand, one hundred".