133221639 has 16 divisors (see below), whose sum is σ = 188310528. Its totient is φ = 83486592.

The previous prime is 133221637. The next prime is 133221691. The reversal of 133221639 is 936122331.

It is not a de Polignac number, because 133221639 - 2¹ = 133221637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133221637) 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, 79084 + ... + 80750.

It is an arithmetic number, because the mean of its divisors is an integer number (11769408).

Almost surely, 2^133221639 is an apocalyptic number.

133221639 is a deficient number, since it is larger than the sum of its proper divisors (55088889).

133221639 is a wasteful number, since it uses less digits than its factorization.

133221639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254.

The product of its digits is 5832, while the sum is 30.

The square root of 133221639 is about 11542.1678639673. The cubic root of 133221639 is about 510.7302610411.

The spelling of 133221639 in words is "one hundred thirty-three million, two hundred twenty-one thousand, six hundred thirty-nine".