21010220022210 has 64 divisors (see below), whose sum is σ = 51041638598400. Its totient is φ = 5534282299392.

The previous prime is 21010220022199. The next prime is 21010220022217. The reversal of 21010220022210 is 1222002201012.

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 21010220022210.

It is not an unprimeable number, because it can be changed into a prime (21010220022217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1205374 + ... + 6593433.

It is an arithmetic number, because the mean of its divisors is an integer number (797525603100).

Almost surely, 2^{21010220022210} is an apocalyptic number.

21010220022210 is an abundant number, since it is smaller than the sum of its proper divisors (30031418576190).

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

21010220022210 is a wasteful number, since it uses less digits than its factorization.

21010220022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7799915.

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

Adding to 21010220022210 its reverse (1222002201012), we get a palindrome (22232222223222).

The spelling of 21010220022210 in words is "twenty-one trillion, ten billion, two hundred twenty million, twenty-two thousand, two hundred ten".