21445103534 has 16 divisors (see below), whose sum is σ = 32991815472. Its totient is φ = 10448984448.

The previous prime is 21445103489. The next prime is 21445103549. The reversal of 21445103534 is 43530154412.

It is a self number, because there is not a number n which added to its sum of digits gives 21445103534.

It is a congruent number.

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, 250709 + ... + 325184.

It is an arithmetic number, because the mean of its divisors is an integer number (2061988467).

Almost surely, 2^21445103534 is an apocalyptic number.

21445103534 is a deficient number, since it is larger than the sum of its proper divisors (11546711938).

21445103534 is a wasteful number, since it uses less digits than its factorization.

21445103534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576371.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21445103534 its reverse (43530154412), we get a palindrome (64975257946).

The spelling of 21445103534 in words is "twenty-one billion, four hundred forty-five million, one hundred three thousand, five hundred thirty-four".