21130013420 has 24 divisors (see below), whose sum is σ = 44408951664. Its totient is φ = 8445162816.

The previous prime is 21130013419. The next prime is 21130013441. The reversal of 21130013420 is 2431003112.

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, 402302 + ... + 451781.

It is an arithmetic number, because the mean of its divisors is an integer number (1850372986).

Almost surely, 2^21130013420 is an apocalyptic number.

21130013420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130013420 is an abundant number, since it is smaller than the sum of its proper divisors (23278938244).

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

21130013420 is a wasteful number, since it uses less digits than its factorization.

21130013420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855329 (or 855327 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130013420 its reverse (2431003112), we get a palindrome (23561016532).

The spelling of 21130013420 in words is "twenty-one billion, one hundred thirty million, thirteen thousand, four hundred twenty".