20130311130021 has 6 divisors (see below), whose sum is σ = 29077116076710. Its totient is φ = 13420207420008.

The previous prime is 20130311130019. The next prime is 20130311130043. The reversal of 20130311130021 is 12003111303102.

20130311130021 is a `hidden beast` number, since 2 + 0 + 1 + 30 + 311 + 1 + 300 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18250958028996 + 1879353101025 = 4272114^2 + 1370895^2 .

It is not a de Polignac number, because 20130311130021 - 2¹ = 20130311130019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20130311129976 and 20130311130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130311130091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118350618326 + ... + 1118350618343.

It is an arithmetic number, because the mean of its divisors is an integer number (4846186012785).

Almost surely, 2^{20130311130021} is an apocalyptic number.

It is an amenable number.

20130311130021 is a deficient number, since it is larger than the sum of its proper divisors (8946804946689).

20130311130021 is a wasteful number, since it uses less digits than its factorization.

20130311130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236701236675 (or 2236701236672 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20130311130021 its reverse (12003111303102), we get a palindrome (32133422433123).

The spelling of 20130311130021 in words is "twenty trillion, one hundred thirty billion, three hundred eleven million, one hundred thirty thousand, twenty-one".