4002551321 has 4 divisors (see below), whose sum is σ = 4042180644. Its totient is φ = 3962922000.

The previous prime is 4002551309. The next prime is 4002551339. The reversal of 4002551321 is 1231552004.

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 2476555225 + 1525996096 = 49765^2 + 39064^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002551321 - 2¹⁰ = 4002550297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4002551341) 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, 19814510 + ... + 19814711.

It is an arithmetic number, because the mean of its divisors is an integer number (1010545161).

Almost surely, 2^4002551321 is an apocalyptic number.

It is an amenable number.

4002551321 is a deficient number, since it is larger than the sum of its proper divisors (39629323).

4002551321 is a wasteful number, since it uses less digits than its factorization.

4002551321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39629322.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 4002551321 is about 63265.7199516452. The cubic root of 4002551321 is about 1587.7384777082.

The spelling of 4002551321 in words is "four billion, two million, five hundred fifty-one thousand, three hundred twenty-one".