102420521 has 8 divisors (see below), whose sum is σ = 117325824. Its totient is φ = 87583680.

The previous prime is 102420511. The next prime is 102420523. The reversal of 102420521 is 125024201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102420521 - 2¹⁰ = 102419497 is a prime.

It is a super-2 number, since 2×102420521² = 20979926243822882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102420521.

It is not an unprimeable number, because it can be changed into a prime (102420523) 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 7 ways as a sum of consecutive naturals, for example, 13865 + ... + 19926.

It is an arithmetic number, because the mean of its divisors is an integer number (14665728).

Almost surely, 2^102420521 is an apocalyptic number.

It is an amenable number.

102420521 is a deficient number, since it is larger than the sum of its proper divisors (14905303).

102420521 is an equidigital number, since it uses as much as digits as its factorization.

102420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34231.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 102420521 is about 10120.3024164301. The cubic root of 102420521 is about 467.8740879892.

Adding to 102420521 its reverse (125024201), we get a palindrome (227444722).

The spelling of 102420521 in words is "one hundred two million, four hundred twenty thousand, five hundred twenty-one".