202421420 has 24 divisors (see below), whose sum is σ = 428851584. Its totient is φ = 80251136.

The previous prime is 202421411. The next prime is 202421437. The reversal of 202421420 is 24124202.

It is a happy number.

It is an unprimeable number.

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, 42524 + ... + 47043.

It is an arithmetic number, because the mean of its divisors is an integer number (17868816).

Almost surely, 2^202421420 is an apocalyptic number.

202421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202421420 is an abundant number, since it is smaller than the sum of its proper divisors (226430164).

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

202421420 is a wasteful number, since it uses less digits than its factorization.

202421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89689 (or 89687 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 202421420 is about 14227.4881830912. The cubic root of 202421420 is about 587.1541782495.

Adding to 202421420 its reverse (24124202), we get a palindrome (226545622).

The spelling of 202421420 in words is "two hundred two million, four hundred twenty-one thousand, four hundred twenty".