21231111001213 has 8 divisors (see below), whose sum is σ = 21303571556960. Its totient is φ = 21158671899600.

The previous prime is 21231111001171. The next prime is 21231111001229. The reversal of 21231111001213 is 31210011113212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21231111001213 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 (21231111005213) 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, 3379698 + ... + 7340611.

It is an arithmetic number, because the mean of its divisors is an integer number (2662946444620).

Almost surely, 2^{21231111001213} is an apocalyptic number.

It is an amenable number.

21231111001213 is a deficient number, since it is larger than the sum of its proper divisors (72460555747).

21231111001213 is a wasteful number, since it uses less digits than its factorization.

21231111001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727067.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21231111001213 its reverse (31210011113212), we get a palindrome (52441122114425).

The spelling of 21231111001213 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred eleven million, one thousand, two hundred thirteen".