21314213121 has 8 divisors (see below), whose sum is σ = 28493153280. Its totient is φ = 14172374192.

The previous prime is 21314213119. The next prime is 21314213147. The reversal of 21314213121 is 12131241312.

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 21314213121 - 2¹ = 21314213119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21314213101) 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, 9273966 + ... + 9276263.

It is an arithmetic number, because the mean of its divisors is an integer number (3561644160).

Almost surely, 2^21314213121 is an apocalyptic number.

It is an amenable number.

21314213121 is a deficient number, since it is larger than the sum of its proper divisors (7178940159).

21314213121 is a wasteful number, since it uses less digits than its factorization.

21314213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18550615.

The product of its digits is 288, while the sum is 21.

Adding to 21314213121 its reverse (12131241312), we get a palindrome (33445454433).

The spelling of 21314213121 in words is "twenty-one billion, three hundred fourteen million, two hundred thirteen thousand, one hundred twenty-one".