21223421120 has 112 divisors (see below), whose sum is σ = 57529951488. Its totient is φ = 7382031360.

The previous prime is 21223421117. The next prime is 21223421201. The reversal of 21223421120 is 2112432212.

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 = 21223421092 and 21223421101.

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, 50114 + ... + 212033.

Almost surely, 2^21223421120 is an apocalyptic number.

21223421120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223421120 is an abundant number, since it is smaller than the sum of its proper divisors (36306530368).

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

21223421120 is a wasteful number, since it uses less digits than its factorization.

21223421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262198 (or 262188 counting only the distinct ones).

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

Adding to 21223421120 its reverse (2112432212), we get a palindrome (23335853332).

The spelling of 21223421120 in words is "twenty-one billion, two hundred twenty-three million, four hundred twenty-one thousand, one hundred twenty".