133501212 has 54 divisors (see below), whose sum is σ = 365433432. Its totient is φ = 41075424.

The previous prime is 133501211. The next prime is 133501213. The reversal of 133501212 is 212105331.

It is an interprime number because it is at equal distance from previous prime (133501211) and next prime (133501213).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133501211) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4888 + ... + 17055.

Almost surely, 2^133501212 is an apocalyptic number.

133501212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133501212 is an abundant number, since it is smaller than the sum of its proper divisors (231932220).

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

133501212 is a wasteful number, since it uses less digits than its factorization.

133501212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21979 (or 21961 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 133501212 is about 11554.2724565418. The cubic root of 133501212 is about 511.0872766803.

Adding to 133501212 its reverse (212105331), we get a palindrome (345606543).

The spelling of 133501212 in words is "one hundred thirty-three million, five hundred one thousand, two hundred twelve".