21210021220231 has 8 divisors (see below), whose sum is σ = 22194270039744. Its totient is φ = 20247404243040.

The previous prime is 21210021220211. The next prime is 21210021220237. The reversal of 21210021220231 is 13202212001212.

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 21210021220231 - 2⁷ = 21210021220103 is a prime.

It is a super-2 number, since 2×21210021220231² (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 = 21210021220199 and 21210021220208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210021220237) 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, 5407958575 + ... + 5407962496.

It is an arithmetic number, because the mean of its divisors is an integer number (2774283754968).

Almost surely, 2^{21210021220231} is an apocalyptic number.

21210021220231 is a deficient number, since it is larger than the sum of its proper divisors (984248819513).

21210021220231 is a wasteful number, since it uses less digits than its factorization.

21210021220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10815921161.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21210021220231 its reverse (13202212001212), we get a palindrome (34412233221443).

The spelling of 21210021220231 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twenty thousand, two hundred thirty-one".