102111221521 has 16 divisors (see below), whose sum is σ = 106793769600. Its totient is φ = 97449187968.

The previous prime is 102111221503. The next prime is 102111221533. The reversal of 102111221521 is 125122111201.

It is not a de Polignac number, because 102111221521 - 2⁵ = 102111221489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102111221221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27018810 + ... + 27022588.

It is an arithmetic number, because the mean of its divisors is an integer number (6674610600).

Almost surely, 2^102111221521 is an apocalyptic number.

It is an amenable number.

102111221521 is a deficient number, since it is larger than the sum of its proper divisors (4682548079).

102111221521 is a wasteful number, since it uses less digits than its factorization.

102111221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6168.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 102111221521 its reverse (125122111201), we get a palindrome (227233332722).

The spelling of 102111221521 in words is "one hundred two billion, one hundred eleven million, two hundred twenty-one thousand, five hundred twenty-one".