21434120120 has 32 divisors (see below), whose sum is σ = 55116309600. Its totient is φ = 7348841088.

The previous prime is 21434120107. The next prime is 21434120137. The reversal of 21434120120 is 2102143412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21434120092 and 21434120101.

It is a congruent number.

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, 38274935 + ... + 38275494.

It is an arithmetic number, because the mean of its divisors is an integer number (1722384675).

Almost surely, 2^21434120120 is an apocalyptic number.

21434120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434120120 is an abundant number, since it is smaller than the sum of its proper divisors (33682189480).

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

21434120120 is a wasteful number, since it uses less digits than its factorization.

21434120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76550447 (or 76550443 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21434120120 its reverse (2102143412), we get a palindrome (23536263532).

The spelling of 21434120120 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty thousand, one hundred twenty".