21231010331221 has 8 divisors (see below), whose sum is σ = 21808682946560. Its totient is φ = 20653540954128.

The previous prime is 21231010331173. The next prime is 21231010331249. The reversal of 21231010331221 is 12213301013212.

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 21231010331221 - 2³³ = 21222420396629 is a prime.

It is a super-2 number, since 2×21231010331221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231010331192 and 21231010331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231010331021) 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, 50597781 + ... + 51015658.

It is an arithmetic number, because the mean of its divisors is an integer number (2726085368320).

Almost surely, 2^{21231010331221} is an apocalyptic number.

It is an amenable number.

21231010331221 is a deficient number, since it is larger than the sum of its proper divisors (577672615339).

21231010331221 is a wasteful number, since it uses less digits than its factorization.

21231010331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101619123.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21231010331221 its reverse (12213301013212), we get a palindrome (33444311344433).

The spelling of 21231010331221 in words is "twenty-one trillion, two hundred thirty-one billion, ten million, three hundred thirty-one thousand, two hundred twenty-one".