4072642521 has 16 divisors (see below), whose sum is σ = 5620017600. Its totient is φ = 2620267328.

The previous prime is 4072642517. The next prime is 4072642549. The reversal of 4072642521 is 1252462704.

It is a cyclic number.

It is not a de Polignac number, because 4072642521 - 2² = 4072642517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4072642121) 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, 204415 + ... + 223451.

It is an arithmetic number, because the mean of its divisors is an integer number (351251100).

Almost surely, 2^4072642521 is an apocalyptic number.

It is an amenable number.

4072642521 is a deficient number, since it is larger than the sum of its proper divisors (1547375079).

4072642521 is a wasteful number, since it uses less digits than its factorization.

4072642521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21528.

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 4072642521 is about 63817.2588019887. The cubic root of 4072642521 is about 1596.9528621167.

The spelling of 4072642521 in words is "four billion, seventy-two million, six hundred forty-two thousand, five hundred twenty-one".