21001231311000 has 64 divisors (see below), whose sum is σ = 65523841699680. Its totient is φ = 5600328348800.

The previous prime is 21001231310989. The next prime is 21001231311001. The reversal of 21001231311000 is 11313210012.

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 (21001231311001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3500202219 + ... + 3500208218.

Almost surely, 2^{21001231311000} is an apocalyptic number.

21001231311000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001231311000 is an abundant number, since it is smaller than the sum of its proper divisors (44522610388680).

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

21001231311000 is a wasteful number, since it uses less digits than its factorization.

21001231311000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000410461 (or 7000410447 counting only the distinct ones).

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

Adding to 21001231311000 its reverse (11313210012), we get a palindrome (21012544521012).

The spelling of 21001231311000 in words is "twenty-one trillion, one billion, two hundred thirty-one million, three hundred eleven thousand".