21023131311 has 240 divisors, whose sum is σ = 41937477120. Its totient is φ = 10215797760.

The previous prime is 21023131303. The next prime is 21023131321. The reversal of 21023131311 is 11313132012.

It is not a de Polignac number, because 21023131311 - 2³ = 21023131303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023131321) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 151245480 + ... + 151245618.

It is an arithmetic number, because the mean of its divisors is an integer number (174739488).

Almost surely, 2^21023131311 is an apocalyptic number.

21023131311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21023131311 is a deficient number, since it is larger than the sum of its proper divisors (20914345809).

21023131311 is a wasteful number, since it uses less digits than its factorization.

21023131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21023131311 its reverse (11313132012), we get a palindrome (32336263323).

The spelling of 21023131311 in words is "twenty-one billion, twenty-three million, one hundred thirty-one thousand, three hundred eleven".