21973009103 has 2 divisors, whose sum is σ = 21973009104. Its totient is φ = 21973009102.

The previous prime is 21973009087. The next prime is 21973009109. The reversal of 21973009103 is 30190037912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21973009103 - 2⁴ = 21973009087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21973009109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10986504551 + 10986504552.

It is an arithmetic number, because the mean of its divisors is an integer number (10986504552).

Almost surely, 2^21973009103 is an apocalyptic number.

21973009103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21973009103 is an equidigital number, since it uses as much as digits as its factorization.

21973009103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The spelling of 21973009103 in words is "twenty-one billion, nine hundred seventy-three million, nine thousand, one hundred three".