21075394211 has 4 divisors (see below), whose sum is σ = 21204691272. Its totient is φ = 20946097152.

The previous prime is 21075394183. The next prime is 21075394229. The reversal of 21075394211 is 11249357012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21075394211 - 2³⁰ = 20001652387 is a prime.

It is a super-2 number, since 2×21075394211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21075394261) 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, 64648286 + ... + 64648611.

It is an arithmetic number, because the mean of its divisors is an integer number (5301172818).

Almost surely, 2^21075394211 is an apocalyptic number.

21075394211 is a deficient number, since it is larger than the sum of its proper divisors (129297061).

21075394211 is a wasteful number, since it uses less digits than its factorization.

21075394211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129297060.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21075394211 in words is "twenty-one billion, seventy-five million, three hundred ninety-four thousand, two hundred eleven".