21004130369 has 2 divisors, whose sum is σ = 21004130370. Its totient is φ = 21004130368.

The previous prime is 21004130341. The next prime is 21004130401. The reversal of 21004130369 is 96303140012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13383713344 + 7620417025 = 115688^2 + 87295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21004130369 - 2⁸ = 21004130113 is a prime.

It is a super-2 number, since 2×21004130369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21004130269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502065184 + 10502065185.

It is an arithmetic number, because the mean of its divisors is an integer number (10502065185).

Almost surely, 2^21004130369 is an apocalyptic number.

It is an amenable number.

21004130369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004130369 is an equidigital number, since it uses as much as digits as its factorization.

21004130369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 21004130369 in words is "twenty-one billion, four million, one hundred thirty thousand, three hundred sixty-nine".