102121145 has 12 divisors (see below), whose sum is σ = 142553124. Its totient is φ = 70025760.

The previous prime is 102121141. The next prime is 102121157. The reversal of 102121145 is 541121201.

It can be written as a sum of positive squares in 2 ways, for example, as 14661241 + 87459904 = 3829^2 + 9352^2 .

It is not a de Polignac number, because 102121145 - 2² = 102121141 is a prime.

It is a super-3 number, since 3×102121145³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (102121141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208166 + ... + 208655.

It is an arithmetic number, because the mean of its divisors is an integer number (11879427).

Almost surely, 2^102121145 is an apocalyptic number.

It is an amenable number.

102121145 is a deficient number, since it is larger than the sum of its proper divisors (40431979).

102121145 is an equidigital number, since it uses as much as digits as its factorization.

102121145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416840 (or 416833 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 102121145 is about 10105.5007298006. The cubic root of 102121145 is about 467.4177765353.

Adding to 102121145 its reverse (541121201), we get a palindrome (643242346).

The spelling of 102121145 in words is "one hundred two million, one hundred twenty-one thousand, one hundred forty-five".