21011331323344 has 40 divisors (see below), whose sum is σ = 41478195259080. Its totient is φ = 10307287031808.

The previous prime is 21011331323273. The next prime is 21011331323347. The reversal of 21011331323344 is 44332313311012.

It can be written as a sum of positive squares in 4 ways, for example, as 9226940857744 + 11784390465600 = 3037588^2 + 3432840^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011331323347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70385152 + ... + 70683040.

It is an arithmetic number, because the mean of its divisors is an integer number (1036954881477).

Almost surely, 2^{21011331323344} is an apocalyptic number.

It is an amenable number.

21011331323344 is a deficient number, since it is larger than the sum of its proper divisors (20466863935736).

21011331323344 is a wasteful number, since it uses less digits than its factorization.

21011331323344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381127 (or 381121 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 21011331323344 its reverse (44332313311012), we get a palindrome (65343644634356).

The spelling of 21011331323344 in words is "twenty-one trillion, eleven billion, three hundred thirty-one million, three hundred twenty-three thousand, three hundred forty-four".