34421721 has 16 divisors (see below), whose sum is σ = 47113920. Its totient is φ = 22346240.

The previous prime is 34421713. The next prime is 34421741. The reversal of 34421721 is 12712443.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 34421721 - 2³ = 34421713 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 34421691 and 34421700.

It is not an unprimeable number, because it can be changed into a prime (34421741) 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, 19141 + ... + 20861.

It is an arithmetic number, because the mean of its divisors is an integer number (2944620).

Almost surely, 2^34421721 is an apocalyptic number.

It is an amenable number.

34421721 is a deficient number, since it is larger than the sum of its proper divisors (12692199).

34421721 is a wasteful number, since it uses less digits than its factorization.

34421721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896.

The product of its digits is 1344, while the sum is 24.

The square root of 34421721 is about 5867.0027271171. The cubic root of 34421721 is about 325.2951039530.

The spelling of 34421721 in words is "thirty-four million, four hundred twenty-one thousand, seven hundred twenty-one".