21031120311000 has 192 divisors, whose sum is σ = 69252395078880. Its totient is φ = 5313124857600.

The previous prime is 21031120310983. The next prime is 21031120311001. The reversal of 21031120311000 is 11302113012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031120311001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8626659 + ... + 10792658.

Almost surely, 2^{21031120311000} is an apocalyptic number.

21031120311000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031120311000 is an abundant number, since it is smaller than the sum of its proper divisors (48221274767880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031120311000 is a wasteful number, since it uses less digits than its factorization.

21031120311000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19419379 (or 19419346 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031120311000 its reverse (11302113012), we get a palindrome (21042422424012).

The spelling of 21031120311000 in words is "twenty-one trillion, thirty-one billion, one hundred twenty million, three hundred eleven thousand".