133221013212 has 144 divisors (see below), whose sum is σ = 365515358208. Its totient is φ = 37652791680.

The previous prime is 133221013117. The next prime is 133221013273. The reversal of 133221013212 is 212310122331.

It is a super-2 number, since 2×133221013212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27403662 + ... + 27408522.

Almost surely, 2^133221013212 is an apocalyptic number.

133221013212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133221013212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182757679104).

133221013212 is an abundant number, since it is smaller than the sum of its proper divisors (232294344996).

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

133221013212 is a wasteful number, since it uses less digits than its factorization.

133221013212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376 (or 5367 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 133221013212 its reverse (212310122331), we get a palindrome (345531135543).

The spelling of 133221013212 in words is "one hundred thirty-three billion, two hundred twenty-one million, thirteen thousand, two hundred twelve".