133554421 has 32 divisors (see below), whose sum is σ = 181230336. Its totient is φ = 95040000.

The previous prime is 133554413. The next prime is 133554427. The reversal of 133554421 is 124455331.

It is not a de Polignac number, because 133554421 - 2³ = 133554413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133554421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133554427) 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, 100441 + ... + 101761.

It is an arithmetic number, because the mean of its divisors is an integer number (5663448).

Almost surely, 2^133554421 is an apocalyptic number.

133554421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133554421 is a deficient number, since it is larger than the sum of its proper divisors (47675915).

133554421 is a wasteful number, since it uses less digits than its factorization.

133554421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its digits is 7200, while the sum is 28.

The square root of 133554421 is about 11556.5747953275. The cubic root of 133554421 is about 511.1551682757.

The spelling of 133554421 in words is "one hundred thirty-three million, five hundred fifty-four thousand, four hundred twenty-one".