102421145 has 8 divisors (see below), whose sum is σ = 122962056. Its totient is φ = 81899136.

The previous prime is 102421133. The next prime is 102421159. The reversal of 102421145 is 541124201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62932489 + 39488656 = 7933^2 + 6284^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102421145 - 2⁸ = 102420889 is a prime.

It is a super-2 number, since 2×102421145² = 20980181886222050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 13829 + ... + 19901.

It is an arithmetic number, because the mean of its divisors is an integer number (15370257).

Almost surely, 2^102421145 is an apocalyptic number.

It is an amenable number.

102421145 is a deficient number, since it is larger than the sum of its proper divisors (20540911).

102421145 is an equidigital number, since it uses as much as digits as its factorization.

102421145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 102421145 is about 10120.3332455014. Note that the first 3 decimals coincide. The cubic root of 102421145 is about 467.8750381661.

Adding to 102421145 its reverse (541124201), we get a palindrome (643545346).

The spelling of 102421145 in words is "one hundred two million, four hundred twenty-one thousand, one hundred forty-five".