21020221200210 has 64 divisors (see below), whose sum is σ = 53251638451200. Its totient is φ = 5295579498432.

The previous prime is 21020221200161. The next prime is 21020221200269. The reversal of 21020221200210 is 1200212202012.

It is a super-3 number, since 3×21020221200210³ (a number of 41 digits) contains 333 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020221200210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51156904 + ... + 51566163.

It is an arithmetic number, because the mean of its divisors is an integer number (832056850800).

Almost surely, 2^{21020221200210} is an apocalyptic number.

21020221200210 is an abundant number, since it is smaller than the sum of its proper divisors (32231417250990).

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

21020221200210 is a wasteful number, since it uses less digits than its factorization.

21020221200210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102723455.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21020221200210 its reverse (1200212202012), we get a palindrome (22220433402222).

The spelling of 21020221200210 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred thousand, two hundred ten".