21442312120 has 64 divisors (see below), whose sum is σ = 50841483840. Its totient is φ = 8122752000.

The previous prime is 21442312091. The next prime is 21442312147. The reversal of 21442312120 is 2121324412.

It is a junction number, because it is equal to n+sod(n) for n = 21442312091 and 21442312100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22461 + ... + 208300.

It is an arithmetic number, because the mean of its divisors is an integer number (794398185).

Almost surely, 2^21442312120 is an apocalyptic number.

21442312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442312120 is an abundant number, since it is smaller than the sum of its proper divisors (29399171720).

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

21442312120 is a wasteful number, since it uses less digits than its factorization.

21442312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230896 (or 230892 counting only the distinct ones).

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

Adding to 21442312120 its reverse (2121324412), we get a palindrome (23563636532).

The spelling of 21442312120 in words is "twenty-one billion, four hundred forty-two million, three hundred twelve thousand, one hundred twenty".