21042451055552 has 28 divisors (see below), whose sum is σ = 42056517527640. Its totient is φ = 10445533253376.

The previous prime is 21042451055513. The next prime is 21042451055623. The reversal of 21042451055552 is 25555015424012.

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, 1182682823 + ... + 1182700614.

It is an arithmetic number, because the mean of its divisors is an integer number (1502018483130).

Almost surely, 2^{21042451055552} is an apocalyptic number.

It is an amenable number.

21042451055552 is a deficient number, since it is larger than the sum of its proper divisors (21014066472088).

21042451055552 is a wasteful number, since it uses less digits than its factorization.

21042451055552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365383588 (or 2365383578 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 41.

Adding to 21042451055552 its reverse (25555015424012), we get a palindrome (46597466479564).

The spelling of 21042451055552 in words is "twenty-one trillion, forty-two billion, four hundred fifty-one million, fifty-five thousand, five hundred fifty-two".