21211102000 has 160 divisors (see below), whose sum is σ = 56065411584. Its totient is φ = 7697376000.

The previous prime is 21211101941. The next prime is 21211102013. The reversal of 21211102000 is 20111212.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19953469 + ... + 19954531.

Almost surely, 2^21211102000 is an apocalyptic number.

21211102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211102000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28032705792).

21211102000 is an abundant number, since it is smaller than the sum of its proper divisors (34854309584).

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

21211102000 is a wasteful number, since it uses less digits than its factorization.

21211102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21211102000 its reverse (20111212), we get a palindrome (21231213212).

The spelling of 21211102000 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand".