21521697300001 has 2 divisors, whose sum is σ = 21521697300002. Its totient is φ = 21521697300000.

The previous prime is 21521697299983. The next prime is 21521697300007. The reversal of 21521697300001 is 10000379612512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18089718746401 + 3431978553600 = 4253201^2 + 1852560^2 .

It is a cyclic number.

It is not a de Polignac number, because 21521697300001 - 2⁷ = 21521697299873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21521697300007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10760848650000 + 10760848650001.

It is an arithmetic number, because the mean of its divisors is an integer number (10760848650001).

Almost surely, 2^{21521697300001} is an apocalyptic number.

It is an amenable number.

21521697300001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21521697300001 is an equidigital number, since it uses as much as digits as its factorization.

21521697300001 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 21521697300001 in words is "twenty-one trillion, five hundred twenty-one billion, six hundred ninety-seven million, three hundred thousand, one".