21552015543412 has 72 divisors (see below), whose sum is σ = 41031816393120. Its totient is φ = 9877426286400.

The previous prime is 21552015543379. The next prime is 21552015543433. The reversal of 21552015543412 is 21434551025512.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 372965962 + ... + 373023742.

Almost surely, 2^{21552015543412} is an apocalyptic number.

It is an amenable number.

21552015543412 is a deficient number, since it is larger than the sum of its proper divisors (19479800849708).

21552015543412 is a wasteful number, since it uses less digits than its factorization.

21552015543412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62973 (or 62940 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

Adding to 21552015543412 its reverse (21434551025512), we get a palindrome (42986566568924).

The spelling of 21552015543412 in words is "twenty-one trillion, five hundred fifty-two billion, fifteen million, five hundred forty-three thousand, four hundred twelve".