21124514002421 has 2 divisors, whose sum is σ = 21124514002422. Its totient is φ = 21124514002420.

The previous prime is 21124514002373. The next prime is 21124514002499. The reversal of 21124514002421 is 12420041542112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20246751130321 + 877762872100 = 4499639^2 + 936890^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124514002421 - 2¹⁸ = 21124513740277 is a prime.

It is a super-2 number, since 2×21124514002421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124514002021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562257001210 + 10562257001211.

It is an arithmetic number, because the mean of its divisors is an integer number (10562257001211).

Almost surely, 2^{21124514002421} is an apocalyptic number.

It is an amenable number.

21124514002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124514002421 is an equidigital number, since it uses as much as digits as its factorization.

21124514002421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 29.

Adding to 21124514002421 its reverse (12420041542112), we get a palindrome (33544555544533).

The spelling of 21124514002421 in words is "twenty-one trillion, one hundred twenty-four billion, five hundred fourteen million, two thousand, four hundred twenty-one".