21051054244 has 48 divisors (see below), whose sum is σ = 43069170816. Its totient is φ = 8905248000.

The previous prime is 21051054223. The next prime is 21051054247. The reversal of 21051054244 is 44245015012.

It is not an unprimeable number, because it can be changed into a prime (21051054247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243657 + ... + 318544.

It is an arithmetic number, because the mean of its divisors is an integer number (897274392).

Almost surely, 2^21051054244 is an apocalyptic number.

It is an amenable number.

21051054244 is an abundant number, since it is smaller than the sum of its proper divisors (22018116572).

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

21051054244 is a wasteful number, since it uses less digits than its factorization.

21051054244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562276 (or 562274 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 21051054244 its reverse (44245015012), we get a palindrome (65296069256).

The spelling of 21051054244 in words is "twenty-one billion, fifty-one million, fifty-four thousand, two hundred forty-four".