21071823327 has 80 divisors (see below), whose sum is σ = 33642568960. Its totient is φ = 13106043648.

The previous prime is 21071823301. The next prime is 21071823337. The reversal of 21071823327 is 72332817012.

It is not a de Polignac number, because 21071823327 - 2²³ = 21063434719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21071823291 and 21071823300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21071823337) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 48664503 + ... + 48664935.

It is an arithmetic number, because the mean of its divisors is an integer number (420532112).

Almost surely, 2^21071823327 is an apocalyptic number.

21071823327 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21071823327 is a deficient number, since it is larger than the sum of its proper divisors (12570745633).

21071823327 is a wasteful number, since it uses less digits than its factorization.

21071823327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21071823327 in words is "twenty-one billion, seventy-one million, eight hundred twenty-three thousand, three hundred twenty-seven".