21439165010044 has 48 divisors (see below), whose sum is σ = 40344890878656. Its totient is φ = 9932138496000.

The previous prime is 21439165010041. The next prime is 21439165010057. The reversal of 21439165010044 is 44001056193412.

It is a junction number, because it is equal to n+sod(n) for n = 21439165009979 and 21439165010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439165010041) 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, 49857 + ... + 6548344.

It is an arithmetic number, because the mean of its divisors is an integer number (840518559972).

Almost surely, 2^{21439165010044} is an apocalyptic number.

It is an amenable number.

21439165010044 is a deficient number, since it is larger than the sum of its proper divisors (18905725868612).

21439165010044 is a wasteful number, since it uses less digits than its factorization.

21439165010044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598966 (or 6598964 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21439165010044 in words is "twenty-one trillion, four hundred thirty-nine billion, one hundred sixty-five million, ten thousand, forty-four".