133401021 has 32 divisors (see below), whose sum is σ = 198159360. Its totient is φ = 79294464.

The previous prime is 133401019. The next prime is 133401031. The reversal of 133401021 is 120104331.

It is not a de Polignac number, because 133401021 - 2¹ = 133401019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133401031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278260 + ... + 278738.

It is an arithmetic number, because the mean of its divisors is an integer number (6192480).

Almost surely, 2^133401021 is an apocalyptic number.

It is an amenable number.

133401021 is a deficient number, since it is larger than the sum of its proper divisors (64758339).

133401021 is a wasteful number, since it uses less digits than its factorization.

133401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 133401021 is about 11549.9359738485. The cubic root of 133401021 is about 510.9593898000.

Adding to 133401021 its reverse (120104331), we get a palindrome (253505352).

The spelling of 133401021 in words is "one hundred thirty-three million, four hundred one thousand, twenty-one".