21023121000240 has 80 divisors (see below), whose sum is σ = 72412972341600. Its totient is φ = 5606165599488.

The previous prime is 21023121000181. The next prime is 21023121000251. The reversal of 21023121000240 is 4200012132012.

It is a happy number.

21023121000240 is a `hidden beast` number, since 2 + 10 + 2 + 312 + 100 + 0 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4866461035 + ... + 4866465354.

It is an arithmetic number, because the mean of its divisors is an integer number (905162154270).

Almost surely, 2^{21023121000240} is an apocalyptic number.

21023121000240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023121000240 is an abundant number, since it is smaller than the sum of its proper divisors (51389851341360).

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

21023121000240 is a wasteful number, since it uses less digits than its factorization.

21023121000240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9732926411 (or 9732926399 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21023121000240 its reverse (4200012132012), we get a palindrome (25223133132252).

The spelling of 21023121000240 in words is "twenty-one trillion, twenty-three billion, one hundred twenty-one million, two hundred forty", and thus it is an aban number.