102111040 has 28 divisors (see below), whose sum is σ = 243152676. Its totient is φ = 40844288.

The previous prime is 102111029. The next prime is 102111047. The reversal of 102111040 is 40111201.

It can be written as a sum of positive squares in 2 ways, for example, as 44836416 + 57274624 = 6696^2 + 7568^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159229 + ... + 159868.

Almost surely, 2^102111040 is an apocalyptic number.

102111040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111040 is an abundant number, since it is smaller than the sum of its proper divisors (141041636).

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

102111040 is an equidigital number, since it uses as much as digits as its factorization.

102111040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319114 (or 319104 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 102111040 is about 10105.0007422068. Note that the first 3 decimals coincide. The cubic root of 102111040 is about 467.4023588585.

Adding to 102111040 its reverse (40111201), we get a palindrome (142222241).

The spelling of 102111040 in words is "one hundred two million, one hundred eleven thousand, forty".