21221122112212 has 12 divisors (see below), whose sum is σ = 40513051305216. Its totient is φ = 9645964596440.

The previous prime is 21221122112191. The next prime is 21221122112273.

21221122112212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241149114868 + ... + 241149114955.

It is an arithmetic number, because the mean of its divisors is an integer number (3376087608768).

Almost surely, 2^{21221122112212} is an apocalyptic number.

21221122112212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221122112212 is a deficient number, since it is larger than the sum of its proper divisors (19291929193004).

21221122112212 is a wasteful number, since it uses less digits than its factorization.

21221122112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482298229838 (or 482298229836 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Multiplying 21221122112212 by its sum of digits (22), we get a palindrome (466864686468664).

It can be divided in two parts, 2122112 and 2112212, that added together give a palindrome (4234324).

The spelling of 21221122112212 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twelve".