102111221540 has 24 divisors (see below), whose sum is σ = 214723763520. Its totient is φ = 40789212768.

The previous prime is 102111221539. The next prime is 102111221557. The reversal of 102111221540 is 45122111201.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 3439592 + ... + 3469151.

It is an arithmetic number, because the mean of its divisors is an integer number (8946823480).

Almost surely, 2^102111221540 is an apocalyptic number.

102111221540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111221540 is an abundant number, since it is smaller than the sum of its proper divisors (112612541980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102111221540 is a wasteful number, since it uses less digits than its factorization.

102111221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909491 (or 6909489 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 102111221540 its reverse (45122111201), we get a palindrome (147233332741).

The spelling of 102111221540 in words is "one hundred two billion, one hundred eleven million, two hundred twenty-one thousand, five hundred forty".