21421134224 has 20 divisors (see below), whose sum is σ = 47432511744. Its totient is φ = 9180486048.

The previous prime is 21421134209. The next prime is 21421134233. The reversal of 21421134224 is 42243112412.

It is a junction number, because it is equal to n+sod(n) for n = 21421134193 and 21421134202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95629952 + ... + 95630175.

Almost surely, 2^21421134224 is an apocalyptic number.

It is an amenable number.

21421134224 is an abundant number, since it is smaller than the sum of its proper divisors (26011377520).

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

21421134224 is a wasteful number, since it uses less digits than its factorization.

21421134224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191260142 (or 191260136 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21421134224 its reverse (42243112412), we get a palindrome (63664246636).

The spelling of 21421134224 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, two hundred twenty-four".