21211122002100 has 36 divisors (see below), whose sum is σ = 61370846326944. Its totient is φ = 5656299200480.

The previous prime is 21211122002087. The next prime is 21211122002137. The reversal of 21211122002100 is 120022111212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21211122002100.

It is a congruent number.

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, 35351869704 + ... + 35351870303.

It is an arithmetic number, because the mean of its divisors is an integer number (1704745731304).

Almost surely, 2^{21211122002100} is an apocalyptic number.

21211122002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211122002100 is an abundant number, since it is smaller than the sum of its proper divisors (40159724324844).

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

21211122002100 is a wasteful number, since it uses less digits than its factorization.

21211122002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70703740024 (or 70703740017 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211122002100 its reverse (120022111212), we get a palindrome (21331144113312).

The spelling of 21211122002100 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, two thousand, one hundred".