421023402 has 24 divisors (see below), whose sum is σ = 913794336. Its totient is φ = 140098536.

The previous prime is 421023371. The next prime is 421023419. The reversal of 421023402 is 204320124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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, 9358 + ... + 30489.

It is an arithmetic number, because the mean of its divisors is an integer number (38074764).

Almost surely, 2^421023402 is an apocalyptic number.

421023402 is an abundant number, since it is smaller than the sum of its proper divisors (492770934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421023402 is a wasteful number, since it uses less digits than its factorization.

421023402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40442 (or 40439 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 421023402 is about 20518.8547926048. The cubic root of 421023402 is about 749.4950093890.

Adding to 421023402 its reverse (204320124), we get a palindrome (625343526).

The spelling of 421023402 in words is "four hundred twenty-one million, twenty-three thousand, four hundred two".