20011430113521 has 80 divisors (see below), whose sum is σ = 34292989338048. Its totient is φ = 10292617776000.

The previous prime is 20011430113403. The next prime is 20011430113547. The reversal of 20011430113521 is 12531103411002.

It is not a de Polignac number, because 20011430113521 - 2²⁷ = 20011295895793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011430113491 and 20011430113500.

It is not an unprimeable number, because it can be changed into a prime (20011430113121) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6752215 + ... + 9252851.

Almost surely, 2^{20011430113521} is an apocalyptic number.

20011430113521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20011430113521 is a deficient number, since it is larger than the sum of its proper divisors (14281559224527).

20011430113521 is a wasteful number, since it uses less digits than its factorization.

20011430113521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500780 (or 2500759 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 20011430113521 its reverse (12531103411002), we get a palindrome (32542533524523).

The spelling of 20011430113521 in words is "twenty trillion, eleven billion, four hundred thirty million, one hundred thirteen thousand, five hundred twenty-one".