734000021 has 4 divisors (see below), whose sum is σ = 747849132. Its totient is φ = 720150912.

The previous prime is 734000017. The next prime is 734000087. The reversal of 734000021 is 120000437.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 655872100 + 78127921 = 25610^2 + 8839^2 .

It is a cyclic number.

It is not a de Polignac number, because 734000021 - 2² = 734000017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (734000221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6924476 + ... + 6924581.

It is an arithmetic number, because the mean of its divisors is an integer number (186962283).

Almost surely, 2^734000021 is an apocalyptic number.

It is an amenable number.

734000021 is a deficient number, since it is larger than the sum of its proper divisors (13849111).

734000021 is a wasteful number, since it uses less digits than its factorization.

734000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13849110.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 734000021 is about 27092.4347558502. The cubic root of 734000021 is about 902.0529354236.

Adding to 734000021 its reverse (120000437), we get a palindrome (854000458).

The spelling of 734000021 in words is "seven hundred thirty-four million, twenty-one", and thus it is an aban number.