21501110342444 has 6 divisors (see below), whose sum is σ = 37626943099284. Its totient is φ = 10750555171220.

The previous prime is 21501110342429. The next prime is 21501110342521. The reversal of 21501110342444 is 44424301110512.

It is a self number, because there is not a number n which added to its sum of digits gives 21501110342444.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2687638792802 + ... + 2687638792809.

It is an arithmetic number, because the mean of its divisors is an integer number (6271157183214).

Almost surely, 2^{21501110342444} is an apocalyptic number.

It is an amenable number.

21501110342444 is a deficient number, since it is larger than the sum of its proper divisors (16125832756840).

21501110342444 is a wasteful number, since it uses less digits than its factorization.

21501110342444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375277585615 (or 5375277585613 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21501110342444 its reverse (44424301110512), we get a palindrome (65925411452956).

The spelling of 21501110342444 in words is "twenty-one trillion, five hundred one billion, one hundred ten million, three hundred forty-two thousand, four hundred forty-four".