20111212102100 has 72 divisors (see below), whose sum is σ = 49877664791808. Its totient is φ = 6895015747200.

The previous prime is 20111212102067. The next prime is 20111212102103. The reversal of 20111212102100 is 120121211102.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111212102103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18757109 + ... + 19800291.

Almost surely, 2^{20111212102100} is an apocalyptic number.

20111212102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111212102100 is an abundant number, since it is smaller than the sum of its proper divisors (29766452689708).

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

20111212102100 is a wasteful number, since it uses less digits than its factorization.

20111212102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070745 (or 1070738 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111212102100 its reverse (120121211102), we get a palindrome (20231333313202).

The spelling of 20111212102100 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, one hundred two thousand, one hundred".