102340021 has 16 divisors (see below), whose sum is σ = 122552320. Its totient is φ = 83611440.

The previous prime is 102340019. The next prime is 102340031. The reversal of 102340021 is 120043201.

It is a cyclic number.

It is not a de Polignac number, because 102340021 - 2¹ = 102340019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102339983 and 102340010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102340031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11020 + ... + 18058.

It is an arithmetic number, because the mean of its divisors is an integer number (7659520).

Almost surely, 2^102340021 is an apocalyptic number.

It is an amenable number.

102340021 is a deficient number, since it is larger than the sum of its proper divisors (20212299).

102340021 is an equidigital number, since it uses as much as digits as its factorization.

102340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 102340021 is about 10116.3244807588. The cubic root of 102340021 is about 467.7514767011.

Adding to 102340021 its reverse (120043201), we get a palindrome (222383222).

The spelling of 102340021 in words is "one hundred two million, three hundred forty thousand, twenty-one".