102243021 has 4 divisors (see below), whose sum is σ = 136324032. Its totient is φ = 68162012.

The previous prime is 102243019. The next prime is 102243059. The reversal of 102243021 is 120342201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102243021 - 2¹ = 102243019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102243061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17040501 + ... + 17040506.

It is an arithmetic number, because the mean of its divisors is an integer number (34081008).

Almost surely, 2^102243021 is an apocalyptic number.

It is an amenable number.

102243021 is a deficient number, since it is larger than the sum of its proper divisors (34081011).

102243021 is an equidigital number, since it uses as much as digits as its factorization.

102243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34081010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 102243021 is about 10111.5291128494. The cubic root of 102243021 is about 467.6036484609.

Adding to 102243021 its reverse (120342201), we get a palindrome (222585222).

The spelling of 102243021 in words is "one hundred two million, two hundred forty-three thousand, twenty-one".