21202442120 has 32 divisors (see below), whose sum is σ = 48417523200. Its totient is φ = 8354394048.

The previous prime is 21202442119. The next prime is 21202442123. The reversal of 21202442120 is 2124420212.

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 = 21202442092 and 21202442101.

It is not an unprimeable number, because it can be changed into a prime (21202442123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3953000 + ... + 3958359.

It is an arithmetic number, because the mean of its divisors is an integer number (1513047600).

Almost surely, 2^21202442120 is an apocalyptic number.

21202442120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202442120 is an abundant number, since it is smaller than the sum of its proper divisors (27215081080).

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

21202442120 is a wasteful number, since it uses less digits than its factorization.

21202442120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7911437 (or 7911433 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202442120 its reverse (2124420212), we get a palindrome (23326862332).

The spelling of 21202442120 in words is "twenty-one billion, two hundred two million, four hundred forty-two thousand, one hundred twenty".