133421636 has 12 divisors (see below), whose sum is σ = 234045420. Its totient is φ = 66551520.

The previous prime is 133421621. The next prime is 133421671. The reversal of 133421636 is 636124331.

It can be written as a sum of positive squares in 2 ways, for example, as 47748100 + 85673536 = 6910^2 + 9256^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133421599 and 133421608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37931 + ... + 41298.

It is an arithmetic number, because the mean of its divisors is an integer number (19503785).

Almost surely, 2^133421636 is an apocalyptic number.

It is an amenable number.

133421636 is a deficient number, since it is larger than the sum of its proper divisors (100623784).

133421636 is a wasteful number, since it uses less digits than its factorization.

133421636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79654 (or 79652 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 133421636 is about 11550.8283685630. The cubic root of 133421636 is about 510.9857086522.

Adding to 133421636 its reverse (636124331), we get a palindrome (769545967).

The spelling of 133421636 in words is "one hundred thirty-three million, four hundred twenty-one thousand, six hundred thirty-six".