4221506639 has 32 divisors (see below), whose sum is σ = 5020409856. Its totient is φ = 3474938880.

The previous prime is 4221506633. The next prime is 4221506693. The reversal of 4221506639 is 9366051224.

It is a de Polignac number, because none of the positive numbers 2^k-4221506639 is a prime.

It is a super-2 number, since 2×4221506639² = 35642236606242152642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221506633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5576249 + ... + 5577005.

It is an arithmetic number, because the mean of its divisors is an integer number (156887808).

Almost surely, 2^4221506639 is an apocalyptic number.

4221506639 is a deficient number, since it is larger than the sum of its proper divisors (798903217).

4221506639 is a wasteful number, since it uses less digits than its factorization.

4221506639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 4221506639 is about 64973.1224353578. The cubic root of 4221506639 is about 1616.1778815591.

The spelling of 4221506639 in words is "four billion, two hundred twenty-one million, five hundred six thousand, six hundred thirty-nine".