21449868929 has 2 divisors, whose sum is σ = 21449868930. Its totient is φ = 21449868928.

The previous prime is 21449868917. The next prime is 21449868941. The reversal of 21449868929 is 92986894412.

It is a balanced prime because it is at equal distance from previous prime (21449868917) and next prime (21449868941).

It can be written as a sum of positive squares in only one way, i.e., 12529444225 + 8920424704 = 111935^2 + 94448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21449868929 - 2¹² = 21449864833 is a prime.

It is not a weakly prime, because it can be changed into another prime (21449868329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724934464 + 10724934465.

It is an arithmetic number, because the mean of its divisors is an integer number (10724934465).

Almost surely, 2^21449868929 is an apocalyptic number.

It is an amenable number.

21449868929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449868929 is an equidigital number, since it uses as much as digits as its factorization.

21449868929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 62.

The spelling of 21449868929 in words is "twenty-one billion, four hundred forty-nine million, eight hundred sixty-eight thousand, nine hundred twenty-nine".