21210231023120 has 160 divisors (see below), whose sum is σ = 50287359403008. Its totient is φ = 8318325855744.

The previous prime is 21210231023087. The next prime is 21210231023141. The reversal of 21210231023120 is 2132013201212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21210231023092 and 21210231023101.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1751892107 + ... + 1751904213.

Almost surely, 2^{21210231023120} is an apocalyptic number.

21210231023120 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 21210231023120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25143679701504).

21210231023120 is an abundant number, since it is smaller than the sum of its proper divisors (29077128379888).

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

21210231023120 is a wasteful number, since it uses less digits than its factorization.

21210231023120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14317 (or 14311 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21210231023120 its reverse (2132013201212), we get a palindrome (23342244224332).

The spelling of 21210231023120 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty-one million, twenty-three thousand, one hundred twenty".