133672421 has 2 divisors, whose sum is σ = 133672422. Its totient is φ = 133672420.

The previous prime is 133672369. The next prime is 133672439. The reversal of 133672421 is 124276331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97792321 + 35880100 = 9889^2 + 5990^2 .

It is a cyclic number.

It is not a de Polignac number, because 133672421 - 2²⁶ = 66563557 is a prime.

It is a super-2 number, since 2×133672421² = 35736632272002482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133672621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66836210 + 66836211.

It is an arithmetic number, because the mean of its divisors is an integer number (66836211).

Almost surely, 2^133672421 is an apocalyptic number.

It is an amenable number.

133672421 is a deficient number, since it is larger than the sum of its proper divisors (1).

133672421 is an equidigital number, since it uses as much as digits as its factorization.

133672421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 133672421 is about 11561.6789870676. The cubic root of 133672421 is about 511.3056651150.

The spelling of 133672421 in words is "one hundred thirty-three million, six hundred seventy-two thousand, four hundred twenty-one".