102143021 has 8 divisors (see below), whose sum is σ = 108464184. Its totient is φ = 95856640.

The previous prime is 102143011. The next prime is 102143029. The reversal of 102143021 is 120341201.

It can be written as a sum of positive squares in 4 ways, for example, as 52722121 + 49420900 = 7261^2 + 7030^2 .

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 102143021 - 2¹⁰ = 102141997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102142987 and 102143005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102143029) 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, 2510 + ... + 14511.

It is an arithmetic number, because the mean of its divisors is an integer number (13558023).

Almost surely, 2^102143021 is an apocalyptic number.

It is an amenable number.

102143021 is a deficient number, since it is larger than the sum of its proper divisors (6321163).

102143021 is a wasteful number, since it uses less digits than its factorization.

102143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17391.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 102143021 is about 10106.5830526444. The cubic root of 102143021 is about 467.4511503001.

Adding to 102143021 its reverse (120341201), we get a palindrome (222484222).

The spelling of 102143021 in words is "one hundred two million, one hundred forty-three thousand, twenty-one".