102111221524 has 24 divisors (see below), whose sum is σ = 192469720520. Its totient is φ = 47121070464.

The previous prime is 102111221503. The next prime is 102111221533. The reversal of 102111221524 is 425122111201.

It can be written as a sum of positive squares in 4 ways, for example, as 29463722500 + 72647499024 = 171650^2 + 269532^2 .

It is a super-2 number, since 2×102111221524² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102111221495 and 102111221504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202522 + ... + 495214.

Almost surely, 2^102111221524 is an apocalyptic number.

It is an amenable number.

102111221524 is a deficient number, since it is larger than the sum of its proper divisors (90358498996).

102111221524 is a wasteful number, since it uses less digits than its factorization.

102111221524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299419 (or 299417 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 102111221524 its reverse (425122111201), we get a palindrome (527233332725).

The spelling of 102111221524 in words is "one hundred two billion, one hundred eleven million, two hundred twenty-one thousand, five hundred twenty-four".