21216030011456 has 56 divisors (see below), whose sum is σ = 48325034281920. Its totient is φ = 9052878638592.

The previous prime is 21216030011441. The next prime is 21216030011489. The reversal of 21216030011456 is 65411003061212.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (32).

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 7 ways as a sum of consecutive naturals, for example, 103297430 + ... + 103502613.

Almost surely, 2^{21216030011456} is an apocalyptic number.

It is an amenable number.

21216030011456 is an abundant number, since it is smaller than the sum of its proper divisors (27109004270464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21216030011456 is a wasteful number, since it uses less digits than its factorization.

21216030011456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206800291 (or 206800281 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 21216030011456 its reverse (65411003061212), we get a palindrome (86627033072668).

The spelling of 21216030011456 in words is "twenty-one trillion, two hundred sixteen billion, thirty million, eleven thousand, four hundred fifty-six".