21100311251355 has 64 divisors (see below), whose sum is σ = 38859304163328. Its totient is φ = 9576954086400.

The previous prime is 21100311251351. The next prime is 21100311251363. The reversal of 21100311251355 is 55315211300112.

It is not a de Polignac number, because 21100311251355 - 2² = 21100311251351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100311251351) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29982777 + ... + 30678453.

It is an arithmetic number, because the mean of its divisors is an integer number (607176627552).

Almost surely, 2^{21100311251355} is an apocalyptic number.

21100311251355 is a deficient number, since it is larger than the sum of its proper divisors (17758992911973).

21100311251355 is a wasteful number, since it uses less digits than its factorization.

21100311251355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697756.

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 21100311251355 its reverse (55315211300112), we get a palindrome (76415522551467).

The spelling of 21100311251355 in words is "twenty-one trillion, one hundred billion, three hundred eleven million, two hundred fifty-one thousand, three hundred fifty-five".