21011442434144 has 24 divisors (see below), whose sum is σ = 41378696078328. Its totient is φ = 10502567239680.

The previous prime is 21011442434089. The next prime is 21011442434161. The reversal of 21011442434144 is 44143424411012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98453537 + ... + 98666720.

It is an arithmetic number, because the mean of its divisors is an integer number (1724112336597).

Almost surely, 2^{21011442434144} is an apocalyptic number.

It is an amenable number.

21011442434144 is a deficient number, since it is larger than the sum of its proper divisors (20367253644184).

21011442434144 is a wasteful number, since it uses less digits than its factorization.

21011442434144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197123598 (or 197123590 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 35.

Adding to 21011442434144 its reverse (44143424411012), we get a palindrome (65154866845156).

The spelling of 21011442434144 in words is "twenty-one trillion, eleven billion, four hundred forty-two million, four hundred thirty-four thousand, one hundred forty-four".