21420411321 has 8 divisors (see below), whose sum is σ = 29044625760. Its totient is φ = 14038235552.

The previous prime is 21420411319. The next prime is 21420411323. The reversal of 21420411321 is 12311402412.

It is an interprime number because it is at equal distance from previous prime (21420411319) and next prime (21420411323).

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

It is a cyclic number.

It is not a de Polignac number, because 21420411321 - 2¹ = 21420411319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21420411323) 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, 60509460 + ... + 60509813.

It is an arithmetic number, because the mean of its divisors is an integer number (3630578220).

Almost surely, 2^21420411321 is an apocalyptic number.

It is an amenable number.

21420411321 is a deficient number, since it is larger than the sum of its proper divisors (7624214439).

21420411321 is a wasteful number, since it uses less digits than its factorization.

21420411321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121019335.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21420411321 its reverse (12311402412), we get a palindrome (33731813733).

The spelling of 21420411321 in words is "twenty-one billion, four hundred twenty million, four hundred eleven thousand, three hundred twenty-one".