21213114444 has 72 divisors (see below), whose sum is σ = 54488266560. Its totient is φ = 6957430272.

The previous prime is 21213114443. The next prime is 21213114469. The reversal of 21213114444 is 44441131212.

21213114444 is a `hidden beast` number, since 2 + 1 + 213 + 1 + 1 + 4 + 444 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21213114443) 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, 820564 + ... + 846020.

It is an arithmetic number, because the mean of its divisors is an integer number (756781480).

Almost surely, 2^21213114444 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 21213114444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27244133280).

21213114444 is an abundant number, since it is smaller than the sum of its proper divisors (33275152116).

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

21213114444 is a wasteful number, since it uses less digits than its factorization.

21213114444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25839 (or 25834 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21213114444 its reverse (44441131212), we get a palindrome (65654245656).

The spelling of 21213114444 in words is "twenty-one billion, two hundred thirteen million, one hundred fourteen thousand, four hundred forty-four".