102402030421 has 4 divisors (see below), whose sum is σ = 103341498700. Its totient is φ = 101462562144.

The previous prime is 102402030373. The next prime is 102402030427. The reversal of 102402030421 is 124030204201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90427105521 + 11974924900 = 300711^2 + 109430^2 .

It is a cyclic number.

It is not a de Polignac number, because 102402030421 - 2¹¹ = 102402028373 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 (102402030427) 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, 469733976 + ... + 469734193.

It is an arithmetic number, because the mean of its divisors is an integer number (25835374675).

Almost surely, 2^102402030421 is an apocalyptic number.

It is an amenable number.

102402030421 is a deficient number, since it is larger than the sum of its proper divisors (939468279).

102402030421 is an equidigital number, since it uses as much as digits as its factorization.

102402030421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939468278.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 102402030421 its reverse (124030204201), we get a palindrome (226432234622).

The spelling of 102402030421 in words is "one hundred two billion, four hundred two million, thirty thousand, four hundred twenty-one".