4221057538 has 8 divisors (see below), whose sum is σ = 6418320588. Its totient is φ = 2081617344.

The previous prime is 4221057487. The next prime is 4221057539. The reversal of 4221057538 is 8357501224.

It can be written as a sum of positive squares in 2 ways, for example, as 3796161769 + 424895769 = 61613^2 + 20613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 4221057497 and 4221057506.

It is not an unprimeable number, because it can be changed into a prime (4221057539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14455531 + ... + 14455822.

Almost surely, 2^4221057538 is an apocalyptic number.

4221057538 is a deficient number, since it is larger than the sum of its proper divisors (2197263050).

4221057538 is a wasteful number, since it uses less digits than its factorization.

4221057538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28911428.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 4221057538 is about 64969.6662912778. Note that the first 3 decimals coincide. The cubic root of 4221057538 is about 1616.1205676737.

The spelling of 4221057538 in words is "four billion, two hundred twenty-one million, fifty-seven thousand, five hundred thirty-eight".