21151443443044 has 24 divisors (see below), whose sum is σ = 37759025743488. Its totient is φ = 10363632945120.

The previous prime is 21151443443029. The next prime is 21151443443069. The reversal of 21151443443044 is 44034434415112.

It is a junction number, because it is equal to n+sod(n) for n = 21151443442988 and 21151443443006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60145692 + ... + 60496339.

It is an arithmetic number, because the mean of its divisors is an integer number (1573292739312).

Almost surely, 2^{21151443443044} is an apocalyptic number.

It is an amenable number.

21151443443044 is a deficient number, since it is larger than the sum of its proper divisors (16607582300444).

21151443443044 is a wasteful number, since it uses less digits than its factorization.

21151443443044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120642915 (or 120642913 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 40.

Adding to 21151443443044 its reverse (44034434415112), we get a palindrome (65185877858156).

The spelling of 21151443443044 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred forty-three million, four hundred forty-three thousand, forty-four".