21401143044 has 24 divisors (see below), whose sum is σ = 49939055040. Its totient is φ = 7133277984.

The previous prime is 21401143033. The next prime is 21401143087. The reversal of 21401143044 is 44034110412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195742 + ... + 284810.

It is an arithmetic number, because the mean of its divisors is an integer number (2080793960).

Almost surely, 2^21401143044 is an apocalyptic number.

It is an amenable number.

21401143044 is an abundant number, since it is smaller than the sum of its proper divisors (28537911996).

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

21401143044 is a wasteful number, since it uses less digits than its factorization.

21401143044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109099 (or 109097 counting only the distinct ones).

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

Adding to 21401143044 its reverse (44034110412), we get a palindrome (65435253456).

The spelling of 21401143044 in words is "twenty-one billion, four hundred one million, one hundred forty-three thousand, forty-four".