421443402 has 16 divisors (see below), whose sum is σ = 843193152. Its totient is φ = 140430080.

The previous prime is 421443401. The next prime is 421443403. The reversal of 421443402 is 204344124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421443401) and next prime (421443403).

It is a super-2 number, since 2×421443402² = 355229082178667208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421443401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7627 + ... + 30017.

It is an arithmetic number, because the mean of its divisors is an integer number (52699572).

Almost surely, 2^421443402 is an apocalyptic number.

421443402 is an abundant number, since it is smaller than the sum of its proper divisors (421749750).

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

421443402 is a wasteful number, since it uses less digits than its factorization.

421443402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25533.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 421443402 is about 20529.0867307827. The cubic root of 421443402 is about 749.7441509538.

Adding to 421443402 its reverse (204344124), we get a palindrome (625787526).

The spelling of 421443402 in words is "four hundred twenty-one million, four hundred forty-three thousand, four hundred two".