21434140120 has 32 divisors (see below), whose sum is σ = 49889811600. Its totient is φ = 8278012288.

The previous prime is 21434140081. The next prime is 21434140127. The reversal of 21434140120 is 2104143412.

It is a happy number.

It is a super-2 number, since 2×21434140120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21434140091 and 21434140100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434140127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9237694 + ... + 9240013.

Almost surely, 2^21434140120 is an apocalyptic number.

21434140120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434140120 is an abundant number, since it is smaller than the sum of its proper divisors (28455671480).

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

21434140120 is a wasteful number, since it uses less digits than its factorization.

21434140120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18477747 (or 18477743 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21434140120 its reverse (2104143412), we get a palindrome (23538283532).

The spelling of 21434140120 in words is "twenty-one billion, four hundred thirty-four million, one hundred forty thousand, one hundred twenty".