21130241421 has 16 divisors (see below), whose sum is σ = 29174266368. Its totient is φ = 13589390400.

The previous prime is 21130241417. The next prime is 21130241437. The reversal of 21130241421 is 12414203112.

It is not a de Polignac number, because 21130241421 - 2² = 21130241417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130241401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328890 + ... + 387851.

It is an arithmetic number, because the mean of its divisors is an integer number (1823391648).

Almost surely, 2^21130241421 is an apocalyptic number.

It is an amenable number.

21130241421 is a deficient number, since it is larger than the sum of its proper divisors (8044024947).

21130241421 is a wasteful number, since it uses less digits than its factorization.

21130241421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717092.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21130241421 its reverse (12414203112), we get a palindrome (33544444533).

The spelling of 21130241421 in words is "twenty-one billion, one hundred thirty million, two hundred forty-one thousand, four hundred twenty-one".