102021145 has 8 divisors (see below), whose sum is σ = 123801480. Its totient is φ = 80699520.

The previous prime is 102021133. The next prime is 102021149. The reversal of 102021145 is 541120201.

It can be written as a sum of positive squares in 4 ways, for example, as 1058841 + 100962304 = 1029^2 + 10048^2 .

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

It is not a de Polignac number, because 102021145 - 2⁵ = 102021113 is a prime.

It is a super-2 number, since 2×102021145² = 20816628054222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102021149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114186 + ... + 115075.

It is an arithmetic number, because the mean of its divisors is an integer number (15475185).

Almost surely, 2^102021145 is an apocalyptic number.

It is an amenable number.

102021145 is a deficient number, since it is larger than the sum of its proper divisors (21780335).

102021145 is an equidigital number, since it uses as much as digits as its factorization.

102021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229355.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 102021145 is about 10100.5517176043. The cubic root of 102021145 is about 467.2651570070.

Adding to 102021145 its reverse (541120201), we get a palindrome (643141346).

The spelling of 102021145 in words is "one hundred two million, twenty-one thousand, one hundred forty-five".