21120410421 has 32 divisors (see below), whose sum is σ = 34147338240. Its totient is φ = 12795246000.

The previous prime is 21120410419. The next prime is 21120410447. The reversal of 21120410421 is 12401402112.

21120410421 is a `hidden beast` number, since 211 + 2 + 0 + 410 + 42 + 1 = 666.

It is not a de Polignac number, because 21120410421 - 2¹ = 21120410419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120410394 and 21120410403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120410471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 834276 + ... + 859218.

It is an arithmetic number, because the mean of its divisors is an integer number (1067104320).

Almost surely, 2^21120410421 is an apocalyptic number.

It is an amenable number.

21120410421 is a deficient number, since it is larger than the sum of its proper divisors (13026927819).

21120410421 is a wasteful number, since it uses less digits than its factorization.

21120410421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27814 (or 27808 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21120410421 its reverse (12401402112), we get a palindrome (33521812533).

The spelling of 21120410421 in words is "twenty-one billion, one hundred twenty million, four hundred ten thousand, four hundred twenty-one".