421231100 has 72 divisors (see below), whose sum is σ = 999186048. Its totient is φ = 153446400.

The previous prime is 421231091. The next prime is 421231103. The reversal of 421231100 is 1132124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421231103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48704 + ... + 56696.

It is an arithmetic number, because the mean of its divisors is an integer number (13877584).

Almost surely, 2^421231100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421231100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499593024).

421231100 is an abundant number, since it is smaller than the sum of its proper divisors (577954948).

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

421231100 is a wasteful number, since it uses less digits than its factorization.

421231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8055 (or 8048 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 421231100 is about 20523.9153184766. The cubic root of 421231100 is about 749.6182353369.

Adding to 421231100 its reverse (1132124), we get a palindrome (422363224).

The spelling of 421231100 in words is "four hundred twenty-one million, two hundred thirty-one thousand, one hundred".