21301011497 has 2 divisors, whose sum is σ = 21301011498. Its totient is φ = 21301011496.

The previous prime is 21301011463. The next prime is 21301011527. The reversal of 21301011497 is 79411010312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16979132416 + 4321879081 = 130304^2 + 65741^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301011497 - 2¹⁴ = 21300995113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301011097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650505748 + 10650505749.

It is an arithmetic number, because the mean of its divisors is an integer number (10650505749).

Almost surely, 2^21301011497 is an apocalyptic number.

It is an amenable number.

21301011497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301011497 is an equidigital number, since it uses as much as digits as its factorization.

21301011497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The spelling of 21301011497 in words is "twenty-one billion, three hundred one million, eleven thousand, four hundred ninety-seven".