21312231032011 has 4 divisors (see below), whose sum is σ = 21453371635024. Its totient is φ = 21171090429000.

The previous prime is 21312231031999. The next prime is 21312231032041. The reversal of 21312231032011 is 11023013221312.

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 21312231032011 - 2¹⁵ = 21312230999243 is a prime.

It is a super-2 number, since 2×21312231032011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312231032041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70570301280 + ... + 70570301581.

It is an arithmetic number, because the mean of its divisors is an integer number (5363342908756).

Almost surely, 2^{21312231032011} is an apocalyptic number.

21312231032011 is a deficient number, since it is larger than the sum of its proper divisors (141140603013).

21312231032011 is a wasteful number, since it uses less digits than its factorization.

21312231032011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141140603012.

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

Adding to 21312231032011 its reverse (11023013221312), we get a palindrome (32335244253323).

The spelling of 21312231032011 in words is "twenty-one trillion, three hundred twelve billion, two hundred thirty-one million, thirty-two thousand, eleven".