102194021 has 4 divisors (see below), whose sum is σ = 108205452. Its totient is φ = 96182592.

The previous prime is 102193997. The next prime is 102194047. The reversal of 102194021 is 120491201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120491201 = 29 ⋅4154869.

It can be written as a sum of positive squares in 2 ways, for example, as 54390625 + 47803396 = 7375^2 + 6914^2 .

It is a cyclic number.

It is not a de Polignac number, because 102194021 - 2⁶ = 102193957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102193984 and 102194002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102194821) 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, 3005690 + ... + 3005723.

It is an arithmetic number, because the mean of its divisors is an integer number (27051363).

Almost surely, 2^102194021 is an apocalyptic number.

It is an amenable number.

102194021 is a deficient number, since it is larger than the sum of its proper divisors (6011431).

102194021 is an equidigital number, since it uses as much as digits as its factorization.

102194021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011430.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 102194021 is about 10109.1058457215. The cubic root of 102194021 is about 467.5289367926.

The spelling of 102194021 in words is "one hundred two million, one hundred ninety-four thousand, twenty-one".