133031421 has 12 divisors (see below), whose sum is σ = 192477948. Its totient is φ = 88539264.

The previous prime is 133031419. The next prime is 133031441. The reversal of 133031421 is 124130331.

133031421 is a `hidden beast` number, since 1 + 330 + 314 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31304025 + 101727396 = 5595^2 + 10086^2 .

It is not a de Polignac number, because 133031421 - 2¹ = 133031419 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133031394 and 133031403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6540 + ... + 17573.

It is an arithmetic number, because the mean of its divisors is an integer number (16039829).

Almost surely, 2^133031421 is an apocalyptic number.

It is an amenable number.

133031421 is a deficient number, since it is larger than the sum of its proper divisors (59446527).

133031421 is a wasteful number, since it uses less digits than its factorization.

133031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24732 (or 24729 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 133031421 is about 11533.9247873393. The cubic root of 133031421 is about 510.4870664064.

Adding to 133031421 its reverse (124130331), we get a palindrome (257161752).

The spelling of 133031421 in words is "one hundred thirty-three million, thirty-one thousand, four hundred twenty-one".