21000104431049 has 2 divisors, whose sum is σ = 21000104431050. Its totient is φ = 21000104431048.

The previous prime is 21000104430983. The next prime is 21000104431051. The reversal of 21000104431049 is 94013440100012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13852539610000 + 7147564821049 = 3721900^2 + 2673493^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000104431049 - 2⁸ = 21000104430793 is a prime.

It is a super-2 number, since 2×21000104431049² (a number of 27 digits) contains 22 as substring.

Together with 21000104431051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21000104431069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500052215524 + 10500052215525.

It is an arithmetic number, because the mean of its divisors is an integer number (10500052215525).

Almost surely, 2^{21000104431049} is an apocalyptic number.

It is an amenable number.

21000104431049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000104431049 is an equidigital number, since it uses as much as digits as its factorization.

21000104431049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21000104431049 in words is "twenty-one trillion, one hundred four million, four hundred thirty-one thousand, forty-nine".