102030021 has 12 divisors (see below), whose sum is σ = 152131200. Its totient is φ = 65825640.

The previous prime is 102030007. The next prime is 102030059. The reversal of 102030021 is 120030201.

It is a happy number.

It is not a de Polignac number, because 102030021 - 2⁹ = 102029509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 102029985 and 102030012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102030121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182571 + ... + 183128.

It is an arithmetic number, because the mean of its divisors is an integer number (12677600).

Almost surely, 2^102030021 is an apocalyptic number.

It is an amenable number.

102030021 is a deficient number, since it is larger than the sum of its proper divisors (50101179).

102030021 is a wasteful number, since it uses less digits than its factorization.

102030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365736 (or 365733 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 102030021 is about 10100.9910899872. The cubic root of 102030021 is about 467.2787075485.

Adding to 102030021 its reverse (120030201), we get a palindrome (222060222).

The spelling of 102030021 in words is "one hundred two million, thirty thousand, twenty-one".