21446232100 has 36 divisors (see below), whose sum is σ = 47061245700. Its totient is φ = 8482101760.

The previous prime is 21446232091. The next prime is 21446232103. The reversal of 21446232100 is 123264412.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1950812224 + 19495419876 = 44168^2 + 139626^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21446232103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1195945 + ... + 1213744.

It is an arithmetic number, because the mean of its divisors is an integer number (1307256825).

Almost surely, 2^21446232100 is an apocalyptic number.

21446232100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21446232100 is an abundant number, since it is smaller than the sum of its proper divisors (25615013600).

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

21446232100 is a wasteful number, since it uses less digits than its factorization.

21446232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409792 (or 2409785 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21446232100 its reverse (123264412), we get a palindrome (21569496512).

The spelling of 21446232100 in words is "twenty-one billion, four hundred forty-six million, two hundred thirty-two thousand, one hundred".