21034142444 has 48 divisors (see below), whose sum is σ = 43457089536. Its totient is φ = 8717457600.

The previous prime is 21034142411. The next prime is 21034142471. The reversal of 21034142444 is 44424143012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287809 + ... + 1304039.

It is an arithmetic number, because the mean of its divisors is an integer number (905356032).

Almost surely, 2^21034142444 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 21034142444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21728544768).

21034142444 is an abundant number, since it is smaller than the sum of its proper divisors (22422947092).

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

21034142444 is a wasteful number, since it uses less digits than its factorization.

21034142444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17766 (or 17764 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21034142444 its reverse (44424143012), we get a palindrome (65458285456).

The spelling of 21034142444 in words is "twenty-one billion, thirty-four million, one hundred forty-two thousand, four hundred forty-four".