133421310 has 128 divisors (see below), whose sum is σ = 391910400. Its totient is φ = 32031360.

The previous prime is 133421291. The next prime is 133421311. The reversal of 133421310 is 13124331.

133421310 is a `hidden beast` number, since 1 + 334 + 21 + 310 = 666.

It is a super-2 number, since 2×133421310² = 35602491924232200, which contains 22 as substring.

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 (133421311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 495856 + ... + 496124.

It is an arithmetic number, because the mean of its divisors is an integer number (3061800).

Almost surely, 2^133421310 is an apocalyptic number.

133421310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 133421310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195955200).

133421310 is an abundant number, since it is smaller than the sum of its proper divisors (258489090).

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

133421310 is a wasteful number, since it uses less digits than its factorization.

133421310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 457 counting only the distinct ones).

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

The square root of 133421310 is about 11550.8142570124. The cubic root of 133421310 is about 510.9852924741.

Adding to 133421310 its reverse (13124331), we get a palindrome (146545641).

The spelling of 133421310 in words is "one hundred thirty-three million, four hundred twenty-one thousand, three hundred ten".