4006421551 has 16 divisors (see below), whose sum is σ = 4438096128. Its totient is φ = 3586161600.

The previous prime is 4006421533. The next prime is 4006421557. The reversal of 4006421551 is 1551246004.

It is a cyclic number.

It is not a de Polignac number, because 4006421551 - 2⁵ = 4006421519 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 (4006421557) 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, 502740 + ... + 510646.

It is an arithmetic number, because the mean of its divisors is an integer number (277381008).

Almost surely, 2^4006421551 is an apocalyptic number.

4006421551 is a deficient number, since it is larger than the sum of its proper divisors (431674577).

4006421551 is a wasteful number, since it uses less digits than its factorization.

4006421551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 4006421551 is about 63296.2996627765. The cubic root of 4006421551 is about 1588.2500625342.

Adding to 4006421551 its reverse (1551246004), we get a palindrome (5557667555).

The spelling of 4006421551 in words is "four billion, six million, four hundred twenty-one thousand, five hundred fifty-one".