21455633655412 has 24 divisors (see below), whose sum is σ = 41206029157440. Its totient is φ = 9694162181760.

The previous prime is 21455633655373. The next prime is 21455633655413.

21455633655412 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21455633655412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455633655413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1459956837 + ... + 1459971532.

It is an arithmetic number, because the mean of its divisors is an integer number (1716917881560).

Almost surely, 2^{21455633655412} is an apocalyptic number.

21455633655412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21455633655412 is a deficient number, since it is larger than the sum of its proper divisors (19750395502028).

21455633655412 is a wasteful number, since it uses less digits than its factorization.

21455633655412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919928551 (or 2919928549 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 52.

The spelling of 21455633655412 in words is "twenty-one trillion, four hundred fifty-five billion, six hundred thirty-three million, six hundred fifty-five thousand, four hundred twelve".