21044051242 has 8 divisors (see below), whose sum is σ = 31568109732. Its totient is φ = 10521348000.

The previous prime is 21044051131. The next prime is 21044051269. The reversal of 21044051242 is 24215044012.

It can be written as a sum of positive squares in 2 ways, for example, as 19029926601 + 2014124641 = 137949^2 + 44879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299059 + ... + 362662.

Almost surely, 2^21044051242 is an apocalyptic number.

21044051242 is a deficient number, since it is larger than the sum of its proper divisors (10524058490).

21044051242 is a wasteful number, since it uses less digits than its factorization.

21044051242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677624.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21044051242 its reverse (24215044012), we get a palindrome (45259095254).

The spelling of 21044051242 in words is "twenty-one billion, forty-four million, fifty-one thousand, two hundred forty-two".