21231321121213 has 8 divisors (see below), whose sum is σ = 24266650356032. Its totient is φ = 18196562726496.

The previous prime is 21231321121147. The next prime is 21231321121237. The reversal of 21231321121213 is 31212112313212.

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

It is not a de Polignac number, because 21231321121213 - 2¹³ = 21231321113021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231321121243) 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, 142630320 + ... + 142779097.

It is an arithmetic number, because the mean of its divisors is an integer number (3033331294504).

Almost surely, 2^{21231321121213} is an apocalyptic number.

It is an amenable number.

21231321121213 is a deficient number, since it is larger than the sum of its proper divisors (3035329234819).

21231321121213 is a wasteful number, since it uses less digits than its factorization.

21231321121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285420051.

The product of its digits is 864, while the sum is 25.

Adding to 21231321121213 its reverse (31212112313212), we get a palindrome (52443433434425).

The spelling of 21231321121213 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred thirteen".