21031301323120 has 40 divisors (see below), whose sum is σ = 53343027903600. Its totient is φ = 7647745935360.

The previous prime is 21031301323037. The next prime is 21031301323121. The reversal of 21031301323120 is 2132310313012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21031301323091 and 21031301323100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031301323121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11949602145 + ... + 11949603904.

It is an arithmetic number, because the mean of its divisors is an integer number (1333575697590).

Almost surely, 2^{21031301323120} is an apocalyptic number.

21031301323120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031301323120 is an abundant number, since it is smaller than the sum of its proper divisors (32311726580480).

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

21031301323120 is a wasteful number, since it uses less digits than its factorization.

21031301323120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23899206073 (or 23899206067 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21031301323120 its reverse (2132310313012), we get a palindrome (23163611636132).

The spelling of 21031301323120 in words is "twenty-one trillion, thirty-one billion, three hundred one million, three hundred twenty-three thousand, one hundred twenty".