21212331110311 has 16 divisors (see below), whose sum is σ = 23940887667840. Its totient is φ = 18617257622880.

The previous prime is 21212331110309. The next prime is 21212331110381. The reversal of 21212331110311 is 11301113321212.

It is a cyclic number.

It is not a de Polignac number, because 21212331110311 - 2¹ = 21212331110309 is a prime.

It is a super-2 number, since 2×21212331110311² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212331110381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407020 + ... + 6526126.

It is an arithmetic number, because the mean of its divisors is an integer number (1496305479240).

Almost surely, 2^{21212331110311} is an apocalyptic number.

21212331110311 is a deficient number, since it is larger than the sum of its proper divisors (2728556557529).

21212331110311 is a wasteful number, since it uses less digits than its factorization.

21212331110311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6130014.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21212331110311 its reverse (11301113321212), we get a palindrome (32513444431523).

The spelling of 21212331110311 in words is "twenty-one trillion, two hundred twelve billion, three hundred thirty-one million, one hundred ten thousand, three hundred eleven".