21100755963 has 64 divisors (see below), whose sum is σ = 34956168192. Its totient is φ = 11047895040.

The previous prime is 21100755959. The next prime is 21100755971. The reversal of 21100755963 is 36955700112.

It is not a de Polignac number, because 21100755963 - 2² = 21100755959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100755943) 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, 2474395 + ... + 2482907.

It is an arithmetic number, because the mean of its divisors is an integer number (546190128).

Almost surely, 2^21100755963 is an apocalyptic number.

21100755963 is a deficient number, since it is larger than the sum of its proper divisors (13855412229).

21100755963 is a wasteful number, since it uses less digits than its factorization.

21100755963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724.

The product of its (nonzero) digits is 56700, while the sum is 39.

The spelling of 21100755963 in words is "twenty-one billion, one hundred million, seven hundred fifty-five thousand, nine hundred sixty-three".