21220111010 has 48 divisors (see below), whose sum is σ = 45865647360. Its totient is φ = 7040769120.

The previous prime is 21220110971. The next prime is 21220111027. The reversal of 21220111010 is 1011102212.

It is a super-2 number, since 2×21220111010² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220110982 and 21220111000.

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, 683300 + ... + 713679.

It is an arithmetic number, because the mean of its divisors is an integer number (955534320).

Almost surely, 2^21220111010 is an apocalyptic number.

21220111010 is an abundant number, since it is smaller than the sum of its proper divisors (24645536350).

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

21220111010 is a wasteful number, since it uses less digits than its factorization.

21220111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397031 (or 1397024 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21220111010 its reverse (1011102212), we get a palindrome (22231213222).

The spelling of 21220111010 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, ten".