21002143131320 has 192 divisors, whose sum is σ = 54600417727200. Its totient is φ = 7245858447360.

The previous prime is 21002143131313. The next prime is 21002143131337. The reversal of 21002143131320 is 2313134120012.

It is a super-2 number, since 2×21002143131320² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8256140 + ... + 10496100.

Almost surely, 2^{21002143131320} is an apocalyptic number.

21002143131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002143131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27300208863600).

21002143131320 is an abundant number, since it is smaller than the sum of its proper divisors (33598274595880).

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

21002143131320 is a wasteful number, since it uses less digits than its factorization.

21002143131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240090 (or 2240073 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21002143131320 its reverse (2313134120012), we get a palindrome (23315277251332).

The spelling of 21002143131320 in words is "twenty-one trillion, two billion, one hundred forty-three million, one hundred thirty-one thousand, three hundred twenty".