102092821 has 4 divisors (see below), whose sum is σ = 102131692. Its totient is φ = 102053952.

The previous prime is 102092819. The next prime is 102092839. The reversal of 102092821 is 128290201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128290201 = 13 ⋅9868477.

It can be written as a sum of positive squares in 2 ways, for example, as 23415921 + 78676900 = 4839^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 102092821 - 2¹ = 102092819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102092891) 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 3 ways as a sum of consecutive naturals, for example, 15186 + ... + 20851.

It is an arithmetic number, because the mean of its divisors is an integer number (25532923).

Almost surely, 2^102092821 is an apocalyptic number.

It is an amenable number.

102092821 is a deficient number, since it is larger than the sum of its proper divisors (38871).

102092821 is an equidigital number, since it uses as much as digits as its factorization.

102092821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38870.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 102092821 is about 10104.0992176443. The cubic root of 102092821 is about 467.3745586974.

The spelling of 102092821 in words is "one hundred two million, ninety-two thousand, eight hundred twenty-one".