21276323421 has 8 divisors (see below), whose sum is σ = 28373659200. Its totient is φ = 14181601632.

The previous prime is 21276323413. The next prime is 21276323437. The reversal of 21276323421 is 12432367212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21276323421 - 2³ = 21276323413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276322421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634425 + ... + 667118.

It is an arithmetic number, because the mean of its divisors is an integer number (3546707400).

Almost surely, 2^21276323421 is an apocalyptic number.

It is an amenable number.

21276323421 is a deficient number, since it is larger than the sum of its proper divisors (7097335779).

21276323421 is a wasteful number, since it uses less digits than its factorization.

21276323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306995.

The product of its digits is 24192, while the sum is 33.

The spelling of 21276323421 in words is "twenty-one billion, two hundred seventy-six million, three hundred twenty-three thousand, four hundred twenty-one".