400421210100 has 72 divisors (see below), whose sum is σ = 1169379717408. Its totient is φ = 105781046400.

The previous prime is 400421210087. The next prime is 400421210117. The reversal of 400421210100 is 1012124004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 400421210100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6204991 + ... + 6269190.

It is an arithmetic number, because the mean of its divisors is an integer number (16241384964).

Almost surely, 2^400421210100 is an apocalyptic number.

It is an amenable number.

400421210100 is an abundant number, since it is smaller than the sum of its proper divisors (768958507308).

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

400421210100 is a wasteful number, since it uses less digits than its factorization.

400421210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12474305 (or 12474298 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 400421210100 its reverse (1012124004), we get a palindrome (401433334104).

The spelling of 400421210100 in words is "four hundred billion, four hundred twenty-one million, two hundred ten thousand, one hundred".