100221031972 has 6 divisors (see below), whose sum is σ = 175386805958. Its totient is φ = 50110515984.

The previous prime is 100221031927. The next prime is 100221031973. The reversal of 100221031972 is 279130122001.

It can be written as a sum of positive squares in only one way, i.e., 98541999396 + 1679032576 = 313914^2 + 40976^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 100221031972.

It is not an unprimeable number, because it can be changed into a prime (100221031973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12527628993 + ... + 12527629000.

Almost surely, 2^100221031972 is an apocalyptic number.

It is an amenable number.

100221031972 is a deficient number, since it is larger than the sum of its proper divisors (75165773986).

100221031972 is a wasteful number, since it uses less digits than its factorization.

100221031972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25055257997 (or 25055257995 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 100221031972 its reverse (279130122001), we get a palindrome (379351153973).

The spelling of 100221031972 in words is "one hundred billion, two hundred twenty-one million, thirty-one thousand, nine hundred seventy-two".