102449921 has 4 divisors (see below), whose sum is σ = 117085632. Its totient is φ = 87814212.

The previous prime is 102449909. The next prime is 102449933. The reversal of 102449921 is 129944201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129944201 = 557 ⋅233293.

It is an interprime number because it is at equal distance from previous prime (102449909) and next prime (102449933).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102449921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102449821) 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, 7317845 + ... + 7317858.

It is an arithmetic number, because the mean of its divisors is an integer number (29271408).

Almost surely, 2^102449921 is an apocalyptic number.

It is an amenable number.

102449921 is a deficient number, since it is larger than the sum of its proper divisors (14635711).

102449921 is an equidigital number, since it uses as much as digits as its factorization.

102449921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14635710.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 102449921 is about 10121.7548379715. The cubic root of 102449921 is about 467.9188517471.

The spelling of 102449921 in words is "one hundred two million, four hundred forty-nine thousand, nine hundred twenty-one".