21031030313120 has 24 divisors (see below), whose sum is σ = 49685809115124. Its totient is φ = 8412412125184.

The previous prime is 21031030313113. The next prime is 21031030313143. The reversal of 21031030313120 is 2131303013012.

It can be written as a sum of positive squares in 2 ways, for example, as 20813997319696 + 217032993424 = 4562236^2 + 465868^2 .

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 = 21031030313092 and 21031030313101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65721969569 + ... + 65721969888.

Almost surely, 2^{21031030313120} is an apocalyptic number.

21031030313120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031030313120 is an abundant number, since it is smaller than the sum of its proper divisors (28654778802004).

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

21031030313120 is a wasteful number, since it uses less digits than its factorization.

21031030313120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131443939472 (or 131443939464 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21031030313120 its reverse (2131303013012), we get a palindrome (23162333326132).

The spelling of 21031030313120 in words is "twenty-one trillion, thirty-one billion, thirty million, three hundred thirteen thousand, one hundred twenty".