133437421 has 8 divisors (see below), whose sum is σ = 149950080. Its totient is φ = 117817392.

The previous prime is 133437413. The next prime is 133437431. The reversal of 133437421 is 124734331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133437421 - 2³ = 133437413 is a prime.

It is a super-3 number, since 3×133437421³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133437421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133437431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222841 + ... + 223438.

It is an arithmetic number, because the mean of its divisors is an integer number (18743760).

Almost surely, 2^133437421 is an apocalyptic number.

It is an amenable number.

133437421 is a deficient number, since it is larger than the sum of its proper divisors (16512659).

133437421 is a wasteful number, since it uses less digits than its factorization.

133437421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446315.

The product of its digits is 6048, while the sum is 28.

The square root of 133437421 is about 11551.5116326825. The cubic root of 133437421 is about 511.0058592854.

The spelling of 133437421 in words is "one hundred thirty-three million, four hundred thirty-seven thousand, four hundred twenty-one".