21101100997 has 16 divisors (see below), whose sum is σ = 22773864960. Its totient is φ = 19486423152.

The previous prime is 21101100989. The next prime is 21101101009. The reversal of 21101100997 is 79900110112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21101100997 - 2³ = 21101100989 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 (21101100947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385278 + ... + 436624.

It is an arithmetic number, because the mean of its divisors is an integer number (1423366560).

Almost surely, 2^21101100997 is an apocalyptic number.

It is an amenable number.

21101100997 is a deficient number, since it is larger than the sum of its proper divisors (1672763963).

21101100997 is a wasteful number, since it uses less digits than its factorization.

21101100997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51912.

The product of its (nonzero) digits is 1134, while the sum is 31.

The spelling of 21101100997 in words is "twenty-one billion, one hundred one million, one hundred thousand, nine hundred ninety-seven".