4221252639 has 6 divisors (see below), whose sum is σ = 6097364936. Its totient is φ = 2814168420.

The previous prime is 4221252619. The next prime is 4221252647. The reversal of 4221252639 is 9362521224.

4221252639 is a `hidden beast` number, since 4 + 2 + 2 + 12 + 5 + 2 + 639 = 666.

It is not a de Polignac number, because 4221252639 - 2²³ = 4212864031 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 (4221252619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234514027 + ... + 234514044.

Almost surely, 2^4221252639 is an apocalyptic number.

4221252639 is a deficient number, since it is larger than the sum of its proper divisors (1876112297).

4221252639 is a wasteful number, since it uses less digits than its factorization.

4221252639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469028077 (or 469028074 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 4221252639 is about 64971.1677515496. The cubic root of 4221252639 is about 1616.1454667958.

The spelling of 4221252639 in words is "four billion, two hundred twenty-one million, two hundred fifty-two thousand, six hundred thirty-nine".