134220021 has 16 divisors (see below), whose sum is σ = 194603136. Its totient is φ = 81792576.

The previous prime is 134219999. The next prime is 134220059. The reversal of 134220021 is 120022431.

It is not a de Polignac number, because 134220021 - 2⁹ = 134219509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134220061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12690 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (12162696).

Almost surely, 2^134220021 is an apocalyptic number.

It is an amenable number.

134220021 is a deficient number, since it is larger than the sum of its proper divisors (60383115).

134220021 is a wasteful number, since it uses less digits than its factorization.

134220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33532.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 134220021 is about 11585.3364646867. The cubic root of 134220021 is about 512.0029156837.

Adding to 134220021 its reverse (120022431), we get a palindrome (254242452).

The spelling of 134220021 in words is "one hundred thirty-four million, two hundred twenty thousand, twenty-one".