21103333973 has 2 divisors, whose sum is σ = 21103333974. Its totient is φ = 21103333972.

The previous prime is 21103333969. The next prime is 21103333981. The reversal of 21103333973 is 37933330112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12480911524 + 8622422449 = 111718^2 + 92857^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103333973 - 2² = 21103333969 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103333073) 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, 10551666986 + 10551666987.

It is an arithmetic number, because the mean of its divisors is an integer number (10551666987).

Almost surely, 2^21103333973 is an apocalyptic number.

It is an amenable number.

21103333973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103333973 is an equidigital number, since it uses as much as digits as its factorization.

21103333973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 35.

The spelling of 21103333973 in words is "twenty-one billion, one hundred three million, three hundred thirty-three thousand, nine hundred seventy-three".