421120420400 has 30 divisors (see below), whose sum is σ = 1011741810972. Its totient is φ = 168448168000.

The previous prime is 421120420397. The next prime is 421120420411. The reversal of 421120420400 is 4024021124.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 526400126 + ... + 526400925.

Almost surely, 2^421120420400 is an apocalyptic number.

421120420400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421120420400 is an abundant number, since it is smaller than the sum of its proper divisors (590621390572).

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

421120420400 is a wasteful number, since it uses less digits than its factorization.

421120420400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052801069 (or 1052801058 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 421120420400 its reverse (4024021124), we get a palindrome (425144441524).

The spelling of 421120420400 in words is "four hundred twenty-one billion, one hundred twenty million, four hundred twenty thousand, four hundred".