21130421242421 has 8 divisors (see below), whose sum is σ = 21812515728384. Its totient is φ = 20448356006160.

The previous prime is 21130421242417. The next prime is 21130421242451. The reversal of 21130421242421 is 12424212403112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21130421242421 - 2² = 21130421242417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130421242451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5839565 + ... + 8738498.

It is an arithmetic number, because the mean of its divisors is an integer number (2726564466048).

Almost surely, 2^{21130421242421} is an apocalyptic number.

It is an amenable number.

21130421242421 is a deficient number, since it is larger than the sum of its proper divisors (682094485963).

21130421242421 is a wasteful number, since it uses less digits than its factorization.

21130421242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14624851.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 21130421242421 its reverse (12424212403112), we get a palindrome (33554633645533).

The spelling of 21130421242421 in words is "twenty-one trillion, one hundred thirty billion, four hundred twenty-one million, two hundred forty-two thousand, four hundred twenty-one".