21201221012213 has 8 divisors (see below), whose sum is σ = 23216546206656. Its totient is φ = 19200552728800.

The previous prime is 21201221012071. The next prime is 21201221012233. The reversal of 21201221012213 is 31221012210212.

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-21201221012213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201221012233) 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, 3664224728 + ... + 3664230513.

It is an arithmetic number, because the mean of its divisors is an integer number (2902068275832).

Almost surely, 2^{21201221012213} is an apocalyptic number.

It is an amenable number.

21201221012213 is a deficient number, since it is larger than the sum of its proper divisors (2015325194443).

21201221012213 is a wasteful number, since it uses less digits than its factorization.

21201221012213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7328455515.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21201221012213 its reverse (31221012210212), we get a palindrome (52422233222425).

The spelling of 21201221012213 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, two hundred thirteen".