134021721 has 8 divisors (see below), whose sum is σ = 178774560. Its totient is φ = 89308352.

The previous prime is 134021717. The next prime is 134021747. The reversal of 134021721 is 127120431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 134021721 - 2² = 134021717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (134021791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (22346820).

Almost surely, 2^134021721 is an apocalyptic number.

It is an amenable number.

134021721 is a deficient number, since it is larger than the sum of its proper divisors (44752839).

134021721 is a wasteful number, since it uses less digits than its factorization.

134021721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19735.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 134021721 is about 11576.7750690769. The cubic root of 134021721 is about 511.7506427873.

The spelling of 134021721 in words is "one hundred thirty-four million, twenty-one thousand, seven hundred twenty-one".