8221693972 has 6 divisors (see below), whose sum is σ = 14387964458. Its totient is φ = 4110846984.

The previous prime is 8221693967. The next prime is 8221693979. The reversal of 8221693972 is 2793961228.

It can be written as a sum of positive squares in only one way, i.e., 8155173636 + 66520336 = 90306^2 + 8156^2 .

It is a super-2 number, since 2×8221693972² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221693979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1027711743 + ... + 1027711750.

Almost surely, 2^8221693972 is an apocalyptic number.

It is an amenable number.

8221693972 is a deficient number, since it is larger than the sum of its proper divisors (6166270486).

8221693972 is a wasteful number, since it uses less digits than its factorization.

8221693972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055423497 (or 2055423495 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 8221693972 is about 90673.5571817936. The cubic root of 8221693972 is about 2018.3064238444.

The spelling of 8221693972 in words is "eight billion, two hundred twenty-one million, six hundred ninety-three thousand, nine hundred seventy-two".