4221391956 has 48 divisors (see below), whose sum is σ = 10374154560. Its totient is φ = 1332322560.

The previous prime is 4221391949. The next prime is 4221391957. The reversal of 4221391956 is 6591931224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221391957) 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, 516010 + ... + 524126.

It is an arithmetic number, because the mean of its divisors is an integer number (216128220).

Almost surely, 2^4221391956 is an apocalyptic number.

It is an amenable number.

4221391956 is an abundant number, since it is smaller than the sum of its proper divisors (6152762604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221391956 is a wasteful number, since it uses less digits than its factorization.

4221391956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10424 (or 10422 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 4221391956 is about 64972.2398875089. The cubic root of 4221391956 is about 1616.1632461993.

The spelling of 4221391956 in words is "four billion, two hundred twenty-one million, three hundred ninety-one thousand, nine hundred fifty-six".