21011321232111 has 32 divisors (see below), whose sum is σ = 32760528192000. Its totient is φ = 11730382462080.

The previous prime is 21011321232049. The next prime is 21011321232127. The reversal of 21011321232111 is 11123212311012.

It is not a de Polignac number, because 21011321232111 - 2¹¹ = 21011321230063 is a prime.

It is a super-2 number, since 2×21011321232111² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011321232911) 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 31 ways as a sum of consecutive naturals, for example, 54850341 + ... + 55232078.

It is an arithmetic number, because the mean of its divisors is an integer number (1023766506000).

Almost surely, 2^{21011321232111} is an apocalyptic number.

21011321232111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21011321232111 is a deficient number, since it is larger than the sum of its proper divisors (11749206959889).

21011321232111 is a wasteful number, since it uses less digits than its factorization.

21011321232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110082639.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21011321232111 its reverse (11123212311012), we get a palindrome (32134533543123).

The spelling of 21011321232111 in words is "twenty-one trillion, eleven billion, three hundred twenty-one million, two hundred thirty-two thousand, one hundred eleven".