21212113003231 has 4 divisors (see below), whose sum is σ = 21272892697000. Its totient is φ = 21151333309464.

The previous prime is 21212113003223. The next prime is 21212113003259. The reversal of 21212113003231 is 13230031121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212113003231 - 2³ = 21212113003223 is a prime.

It is a super-2 number, since 2×21212113003231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212113003271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30389846361 + ... + 30389847058.

It is an arithmetic number, because the mean of its divisors is an integer number (5318223174250).

Almost surely, 2^{21212113003231} is an apocalyptic number.

21212113003231 is a deficient number, since it is larger than the sum of its proper divisors (60779693769).

21212113003231 is an equidigital number, since it uses as much as digits as its factorization.

21212113003231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60779693768.

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

Adding to 21212113003231 its reverse (13230031121212), we get a palindrome (34442144124443).

The spelling of 21212113003231 in words is "twenty-one trillion, two hundred twelve billion, one hundred thirteen million, three thousand, two hundred thirty-one".