21220210111122 has 36 divisors (see below), whose sum is σ = 50536836481950. Its totient is φ = 6430366699680.

The previous prime is 21220210110949. The next prime is 21220210111123. The reversal of 21220210111122 is 22111101202212.

21220210111122 is a `hidden beast` number, since 2 + 1 + 220 + 210 + 111 + 122 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20637749608641 + 582460502481 = 4542879^2 + 763191^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21220210111095 and 21220210111104.

It is not an unprimeable number, because it can be changed into a prime (21220210111123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4871487747 + ... + 4871492102.

Almost surely, 2^{21220210111122} is an apocalyptic number.

21220210111122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21220210111122 is an abundant number, since it is smaller than the sum of its proper divisors (29316626370828).

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

21220210111122 is a wasteful number, since it uses less digits than its factorization.

21220210111122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9742979879 (or 9742979865 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220210111122 its reverse (22111101202212), we get a palindrome (43331311313334).

The spelling of 21220210111122 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred eleven thousand, one hundred twenty-two".