21000059497 has 2 divisors, whose sum is σ = 21000059498. Its totient is φ = 21000059496.

The previous prime is 21000059467. The next prime is 21000059503. The reversal of 21000059497 is 79495000012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17059233321 + 3940826176 = 130611^2 + 62776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000059497 - 2⁷ = 21000059369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000059447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500029748 + 10500029749.

It is an arithmetic number, because the mean of its divisors is an integer number (10500029749).

Almost surely, 2^21000059497 is an apocalyptic number.

It is an amenable number.

21000059497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000059497 is an equidigital number, since it uses as much as digits as its factorization.

21000059497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21000059497 in words is "twenty-one billion, fifty-nine thousand, four hundred ninety-seven".