21213222231212 has 24 divisors (see below), whose sum is σ = 42880203228240. Its totient is φ = 9075175285760.

The previous prime is 21213222231167. The next prime is 21213222231217.

21213222231212 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21213222231217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14179960637 + ... + 14179962132.

It is an arithmetic number, because the mean of its divisors is an integer number (1786675134510).

Almost surely, 2^{21213222231212} is an apocalyptic number.

21213222231212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21213222231212 is an abundant number, since it is smaller than the sum of its proper divisors (21666980997028).

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

21213222231212 is a wasteful number, since it uses less digits than its factorization.

21213222231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28359922801 (or 28359922799 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

It can be divided in two parts, 2121322 and 2231212, that added together give a palindrome (4352534).

The spelling of 21213222231212 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty-two million, two hundred thirty-one thousand, two hundred twelve".