21451214213 has 8 divisors (see below), whose sum is σ = 25201426656. Its totient is φ = 18001018800.

The previous prime is 21451214179. The next prime is 21451214219. The reversal of 21451214213 is 31241215412.

It is a happy number.

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 21451214213 - 2¹² = 21451210117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451214219) 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, 75004103 + ... + 75004388.

It is an arithmetic number, because the mean of its divisors is an integer number (3150178332).

Almost surely, 2^21451214213 is an apocalyptic number.

It is an amenable number.

21451214213 is a deficient number, since it is larger than the sum of its proper divisors (3750212443).

21451214213 is a wasteful number, since it uses less digits than its factorization.

21451214213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150008515.

The product of its digits is 1920, while the sum is 26.

Adding to 21451214213 its reverse (31241215412), we get a palindrome (52692429625).

The spelling of 21451214213 in words is "twenty-one billion, four hundred fifty-one million, two hundred fourteen thousand, two hundred thirteen".