21211101000100 has 36 divisors (see below), whose sum is σ = 50212460915568. Its totient is φ = 7713127636000.

The previous prime is 21211101000079. The next prime is 21211101000109. The reversal of 21211101000100 is 100010111212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21211101000109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9641408446 + ... + 9641410645.

It is an arithmetic number, because the mean of its divisors is an integer number (1394790580988).

Almost surely, 2^{21211101000100} is an apocalyptic number.

21211101000100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211101000100 is an abundant number, since it is smaller than the sum of its proper divisors (29001359915468).

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

21211101000100 is a wasteful number, since it uses less digits than its factorization.

21211101000100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19282819116 (or 19282819109 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21211101000100 its reverse (100010111212), we get a palindrome (21311111111312).

The spelling of 21211101000100 in words is "twenty-one trillion, two hundred eleven billion, one hundred one million, one hundred", and thus it is an aban number.