21116011213455 has 32 divisors (see below), whose sum is σ = 34194791245248. Its totient is φ = 11125969536000.

The previous prime is 21116011213447. The next prime is 21116011213469. The reversal of 21116011213455 is 55431211061112.

It is not a de Polignac number, because 21116011213455 - 2³ = 21116011213447 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 14557056 + ... + 15941765.

It is an arithmetic number, because the mean of its divisors is an integer number (1068587226414).

Almost surely, 2^{21116011213455} is an apocalyptic number.

21116011213455 is a deficient number, since it is larger than the sum of its proper divisors (13078780031793).

21116011213455 is a wasteful number, since it uses less digits than its factorization.

21116011213455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30499387.

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 21116011213455 its reverse (55431211061112), we get a palindrome (76547222274567).

The spelling of 21116011213455 in words is "twenty-one trillion, one hundred sixteen billion, eleven million, two hundred thirteen thousand, four hundred fifty-five".