21321033049 has 2 divisors, whose sum is σ = 21321033050. Its totient is φ = 21321033048.

The previous prime is 21321033043. The next prime is 21321033067. The reversal of 21321033049 is 94033012312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19287654400 + 2033378649 = 138880^2 + 45093^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321033049 - 2¹⁷ = 21320901977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321033043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660516524 + 10660516525.

It is an arithmetic number, because the mean of its divisors is an integer number (10660516525).

Almost surely, 2^21321033049 is an apocalyptic number.

It is an amenable number.

21321033049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321033049 is an equidigital number, since it uses as much as digits as its factorization.

21321033049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21321033049 in words is "twenty-one billion, three hundred twenty-one million, thirty-three thousand, forty-nine".