3962191221 has 10 divisors (see below), whose sum is σ = 5918828982. Its totient is φ = 2641460760.

The previous prime is 3962191217. The next prime is 3962191223. The reversal of 3962191221 is 1221912693.

3962191221 is a `hidden beast` number, since 3 + 9 + 621 + 9 + 1 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1981496196 + 1980695025 = 44514^2 + 44505^2 .

It is not a de Polignac number, because 3962191221 - 2² = 3962191217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3962191223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24457890 + ... + 24458051.

Almost surely, 2^3962191221 is an apocalyptic number.

It is an amenable number.

3962191221 is a deficient number, since it is larger than the sum of its proper divisors (1956637761).

3962191221 is an equidigital number, since it uses as much as digits as its factorization.

3962191221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48915953 (or 48915944 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 3962191221 is about 62945.9388761499. The cubic root of 3962191221 is about 1582.3837357589.

The spelling of 3962191221 in words is "three billion, nine hundred sixty-two million, one hundred ninety-one thousand, two hundred twenty-one".