21131411020 has 24 divisors (see below), whose sum is σ = 45807447168. Its totient is φ = 8179900800.

The previous prime is 21131411017. The next prime is 21131411033. The reversal of 21131411020 is 2011413112.

It is a junction number, because it is equal to n+sod(n) for n = 21131410985 and 21131411003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17040841 + ... + 17042080.

It is an arithmetic number, because the mean of its divisors is an integer number (1908643632).

Almost surely, 2^21131411020 is an apocalyptic number.

21131411020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131411020 is an abundant number, since it is smaller than the sum of its proper divisors (24676036148).

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

21131411020 is a wasteful number, since it uses less digits than its factorization.

21131411020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34082961 (or 34082959 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21131411020 its reverse (2011413112), we get a palindrome (23142824132).

The spelling of 21131411020 in words is "twenty-one billion, one hundred thirty-one million, four hundred eleven thousand, twenty".