102121240 has 32 divisors (see below), whose sum is σ = 247448880. Its totient is φ = 37706112.

The previous prime is 102121237. The next prime is 102121247. The reversal of 102121240 is 42121201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 102121240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97674 + ... + 98713.

Almost surely, 2^102121240 is an apocalyptic number.

102121240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102121240 is an abundant number, since it is smaller than the sum of its proper divisors (145327640).

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

102121240 is a wasteful number, since it uses less digits than its factorization.

102121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196411 (or 196407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 102121240 is about 10105.5054302098. The cubic root of 102121240 is about 467.4179214765.

Adding to 102121240 its reverse (42121201), we get a palindrome (144242441).

The spelling of 102121240 in words is "one hundred two million, one hundred twenty-one thousand, two hundred forty".