34720021 has 8 divisors (see below), whose sum is σ = 39795264. Its totient is φ = 29673600.

The previous prime is 34720009. The next prime is 34720027. The reversal of 34720021 is 12002743.

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 34720021 - 2¹⁵ = 34687253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34720027) 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, 4555 + ... + 9496.

It is an arithmetic number, because the mean of its divisors is an integer number (4974408).

Almost surely, 2^34720021 is an apocalyptic number.

It is an amenable number.

34720021 is a deficient number, since it is larger than the sum of its proper divisors (5075243).

34720021 is a wasteful number, since it uses less digits than its factorization.

34720021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14411.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 34720021 is about 5892.3697270283. The cubic root of 34720021 is about 326.2320759568.

Adding to 34720021 its reverse (12002743), we get a palindrome (46722764).

The spelling of 34720021 in words is "thirty-four million, seven hundred twenty thousand, twenty-one".