21221363212453 has 16 divisors (see below), whose sum is σ = 23114859580800. Its totient is φ = 19405902922560.

The previous prime is 21221363212447. The next prime is 21221363212463. The reversal of 21221363212453 is 35421236312212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221363212453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221363212463) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3223026 + ... + 7268467.

It is an arithmetic number, because the mean of its divisors is an integer number (1444678723800).

Almost surely, 2^{21221363212453} is an apocalyptic number.

It is an amenable number.

21221363212453 is a deficient number, since it is larger than the sum of its proper divisors (1893496368347).

21221363212453 is a wasteful number, since it uses less digits than its factorization.

21221363212453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10495212.

The product of its digits is 103680, while the sum is 37.

Adding to 21221363212453 its reverse (35421236312212), we get a palindrome (56642599524665).

The spelling of 21221363212453 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-three million, two hundred twelve thousand, four hundred fifty-three".