21213233231212 has 48 divisors (see below), whose sum is σ = 41352413733792. Its totient is φ = 9440872980480.

The previous prime is 21213233231131. The next prime is 21213233231213.

21213233231212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21213233231212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213233231213) 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, 23663493 + ... + 24543580.

It is an arithmetic number, because the mean of its divisors is an integer number (861508619454).

Almost surely, 2^{21213233231212} is an apocalyptic number.

21213233231212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21213233231212 is a deficient number, since it is larger than the sum of its proper divisors (20139180502580).

21213233231212 is a wasteful number, since it uses less digits than its factorization.

21213233231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48207298 (or 48207296 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

It can be divided in two parts, 2121323 and 3231212, that added together give a palindrome (5352535).

The spelling of 21213233231212 in words is "twenty-one trillion, two hundred thirteen billion, two hundred thirty-three million, two hundred thirty-one thousand, two hundred twelve".