21035238097 has 2 divisors, whose sum is σ = 21035238098. Its totient is φ = 21035238096.

The previous prime is 21035238061. The next prime is 21035238121. The reversal of 21035238097 is 79083253012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12628365376 + 8406872721 = 112376^2 + 91689^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035238097 - 2¹⁵ = 21035205329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21035238017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517619048 + 10517619049.

It is an arithmetic number, because the mean of its divisors is an integer number (10517619049).

Almost surely, 2^21035238097 is an apocalyptic number.

It is an amenable number.

21035238097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035238097 is an equidigital number, since it uses as much as digits as its factorization.

21035238097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21035238097 in words is "twenty-one billion, thirty-five million, two hundred thirty-eight thousand, ninety-seven".