4221901985 has 12 divisors (see below), whose sum is σ = 5893430868. Its totient is φ = 2895018336.

The previous prime is 4221901969. The next prime is 4221901991. The reversal of 4221901985 is 5891091224.

It can be written as a sum of positive squares in 2 ways, for example, as 2259766369 + 1962135616 = 47537^2 + 44296^2 .

It is not a de Polignac number, because 4221901985 - 2⁴ = 4221901969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8615882 + ... + 8616371.

It is an arithmetic number, because the mean of its divisors is an integer number (491119239).

Almost surely, 2^4221901985 is an apocalyptic number.

It is an amenable number.

4221901985 is a deficient number, since it is larger than the sum of its proper divisors (1671528883).

4221901985 is a wasteful number, since it uses less digits than its factorization.

4221901985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17232272 (or 17232265 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 4221901985 is about 64976.1647452356. The cubic root of 4221901985 is about 1616.2283319134.

The spelling of 4221901985 in words is "four billion, two hundred twenty-one million, nine hundred one thousand, nine hundred eighty-five".