21271763029 has 4 divisors (see below), whose sum is σ = 23205559680. Its totient is φ = 19337966380.

The previous prime is 21271763011. The next prime is 21271763039. The reversal of 21271763029 is 92036717212.

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.

It is a cyclic number.

It is not a de Polignac number, because 21271763029 - 2¹¹ = 21271760981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21271762982 and 21271763000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271763039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966898309 + ... + 966898330.

It is an arithmetic number, because the mean of its divisors is an integer number (5801389920).

Almost surely, 2^21271763029 is an apocalyptic number.

It is an amenable number.

21271763029 is a deficient number, since it is larger than the sum of its proper divisors (1933796651).

21271763029 is a wasteful number, since it uses less digits than its factorization.

21271763029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933796650.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 21271763029 in words is "twenty-one billion, two hundred seventy-one million, seven hundred sixty-three thousand, twenty-nine".