21211222211212 has 48 divisors (see below), whose sum is σ = 41196699532800. Its totient is φ = 9474319924160.

The previous prime is 21211222211209. The next prime is 21211222211219.

21211222211212 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 not an unprimeable number, because it can be changed into a prime (21211222211219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4995114 + ... + 8208142.

It is an arithmetic number, because the mean of its divisors is an integer number (858264573600).

Almost surely, 2^{21211222211212} is an apocalyptic number.

21211222211212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21211222211212 is a deficient number, since it is larger than the sum of its proper divisors (19985477321588).

21211222211212 is a wasteful number, since it uses less digits than its factorization.

21211222211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215646 (or 3215644 counting only the distinct ones).

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

Multiplying 21211222211212 by its sum of digits (22), we get a palindrome (466646888646664).

It can be divided in two parts, 2121122 and 2211212, that added together give a palindrome (4332334).

The spelling of 21211222211212 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twelve".