21101459297 has 4 divisors (see below), whose sum is σ = 21101758656. Its totient is φ = 21101159940.

The previous prime is 21101459231. The next prime is 21101459369. The reversal of 21101459297 is 79295410112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21101459297 - 2²⁴ = 21084682081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101059297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20708 + ... + 206474.

It is an arithmetic number, because the mean of its divisors is an integer number (5275439664).

Almost surely, 2^21101459297 is an apocalyptic number.

It is an amenable number.

21101459297 is a deficient number, since it is larger than the sum of its proper divisors (299359).

21101459297 is a wasteful number, since it uses less digits than its factorization.

21101459297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299358.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 21101459297 in words is "twenty-one billion, one hundred one million, four hundred fifty-nine thousand, two hundred ninety-seven".