21421132120 has 32 divisors (see below), whose sum is σ = 48439764000. Its totient is φ = 8525392128.

The previous prime is 21421132097. The next prime is 21421132123. The reversal of 21421132120 is 2123112412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421132123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1337589 + ... + 1353508.

It is an arithmetic number, because the mean of its divisors is an integer number (1513742625).

Almost surely, 2^21421132120 is an apocalyptic number.

21421132120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421132120 is an abundant number, since it is smaller than the sum of its proper divisors (27018631880).

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

21421132120 is a wasteful number, since it uses less digits than its factorization.

21421132120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691307 (or 2691303 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21421132120 its reverse (2123112412), we get a palindrome (23544244532).

The spelling of 21421132120 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-two thousand, one hundred twenty".