102121518 has 16 divisors (see below), whose sum is σ = 213123456. Its totient is φ = 32560440.

The previous prime is 102121489. The next prime is 102121519. The reversal of 102121518 is 815121201.

It is a junction number, because it is equal to n+sod(n) for n = 102121494 and 102121503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121519) 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, 369868 + ... + 370143.

It is an arithmetic number, because the mean of its divisors is an integer number (13320216).

Almost surely, 2^102121518 is an apocalyptic number.

102121518 is an abundant number, since it is smaller than the sum of its proper divisors (111001938).

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

102121518 is a wasteful number, since it uses less digits than its factorization.

102121518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740039.

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 102121518 is about 10105.5191850790. The cubic root of 102121518 is about 467.4183456196.

Adding to 102121518 its reverse (815121201), we get a palindrome (917242719).

The spelling of 102121518 in words is "one hundred two million, one hundred twenty-one thousand, five hundred eighteen".