21000144023232 has 56 divisors (see below), whose sum is σ = 60614052073152. Its totient is φ = 6363680006400.

The previous prime is 21000144023203. The next prime is 21000144023297. The reversal of 21000144023232 is 23232044100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4971622894 + ... + 4971627117.

Almost surely, 2^{21000144023232} is an apocalyptic number.

21000144023232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000144023232 is an abundant number, since it is smaller than the sum of its proper divisors (39613908049920).

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

21000144023232 is a wasteful number, since it uses less digits than its factorization.

21000144023232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943250037 (or 9943250027 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21000144023232 its reverse (23232044100012), we get a palindrome (44232188123244).

The spelling of 21000144023232 in words is "twenty-one trillion, one hundred forty-four million, twenty-three thousand, two hundred thirty-two".