21044213142 has 8 divisors (see below), whose sum is σ = 42088426296. Its totient is φ = 7014737712.

The previous prime is 21044213119. The next prime is 21044213143. The reversal of 21044213142 is 24131244012.

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

21044213142 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044213143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1753684423 + ... + 1753684434.

It is an arithmetic number, because the mean of its divisors is an integer number (5261053287).

Almost surely, 2^21044213142 is an apocalyptic number.

21044213142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21044213142 is a wasteful number, since it uses less digits than its factorization.

21044213142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507368862.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21044213142 its reverse (24131244012), we get a palindrome (45175457154).

The spelling of 21044213142 in words is "twenty-one billion, forty-four million, two hundred thirteen thousand, one hundred forty-two".