21210211000 has 96 divisors (see below), whose sum is σ = 54554376240. Its totient is φ = 7712760000.

The previous prime is 21210210991. The next prime is 21210211027. The reversal of 21210211000 is 11201212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33355 + ... + 208645.

Almost surely, 2^21210211000 is an apocalyptic number.

21210211000 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 21210211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27277188120).

21210211000 is an abundant number, since it is smaller than the sum of its proper divisors (33344165240).

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

21210211000 is a wasteful number, since it uses less digits than its factorization.

21210211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175334 (or 175309 counting only the distinct ones).

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

Adding to 21210211000 its reverse (11201212), we get a palindrome (21221412212).

The spelling of 21210211000 in words is "twenty-one billion, two hundred ten million, two hundred eleven thousand".