21092193071 has 4 divisors (see below), whose sum is σ = 21490159032. Its totient is φ = 20694227112.

The previous prime is 21092193061. The next prime is 21092193091. The reversal of 21092193071 is 17039129012.

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 21092193071 - 2¹⁰ = 21092192047 is a prime.

It is a super-2 number, since 2×21092193071² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092193061) 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, 198982901 + ... + 198983006.

It is an arithmetic number, because the mean of its divisors is an integer number (5372539758).

Almost surely, 2^21092193071 is an apocalyptic number.

21092193071 is a deficient number, since it is larger than the sum of its proper divisors (397965961).

21092193071 is an equidigital number, since it uses as much as digits as its factorization.

21092193071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397965960.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 21092193071 in words is "twenty-one billion, ninety-two million, one hundred ninety-three thousand, seventy-one".