102213440 has 56 divisors (see below), whose sum is σ = 278172672. Its totient is φ = 35043840.

The previous prime is 102213413. The next prime is 102213443. The reversal of 102213440 is 44312201.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102213443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20576 + ... + 25055.

Almost surely, 2^102213440 is an apocalyptic number.

102213440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102213440 is an abundant number, since it is smaller than the sum of its proper divisors (175959232).

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

102213440 is an equidigital number, since it uses as much as digits as its factorization.

102213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45655 (or 45645 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 102213440 is about 10110.0662708016. The cubic root of 102213440 is about 467.5585483404.

Adding to 102213440 its reverse (44312201), we get a palindrome (146525641).

The spelling of 102213440 in words is "one hundred two million, two hundred thirteen thousand, four hundred forty".