21230276671 has 4 divisors (see below), whose sum is σ = 21341430144. Its totient is φ = 21119123200.

The previous prime is 21230276663. The next prime is 21230276687. The reversal of 21230276671 is 17667203212.

It is a happy number.

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 21230276671 - 2³ = 21230276663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21230276671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230276371) 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, 55576450 + ... + 55576831.

It is an arithmetic number, because the mean of its divisors is an integer number (5335357536).

Almost surely, 2^21230276671 is an apocalyptic number.

21230276671 is a deficient number, since it is larger than the sum of its proper divisors (111153473).

21230276671 is a wasteful number, since it uses less digits than its factorization.

21230276671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111153472.

The product of its (nonzero) digits is 42336, while the sum is 37.

Adding to 21230276671 its reverse (17667203212), we get a palindrome (38897479883).

The spelling of 21230276671 in words is "twenty-one billion, two hundred thirty million, two hundred seventy-six thousand, six hundred seventy-one".