21001120210 has 48 divisors (see below), whose sum is σ = 44719153920. Its totient is φ = 7078333920.

The previous prime is 21001120193. The next prime is 21001120243. The reversal of 21001120210 is 1202110012.

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

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, 334306 + ... + 392125.

It is an arithmetic number, because the mean of its divisors is an integer number (931649040).

Almost surely, 2^21001120210 is an apocalyptic number.

21001120210 is an abundant number, since it is smaller than the sum of its proper divisors (23718033710).

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

21001120210 is a wasteful number, since it uses less digits than its factorization.

21001120210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726511 (or 726504 counting only the distinct ones).

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

Adding to 21001120210 its reverse (1202110012), we get a palindrome (22203230222).

The spelling of 21001120210 in words is "twenty-one billion, one million, one hundred twenty thousand, two hundred ten".