21003001101491 has 2 divisors, whose sum is σ = 21003001101492. Its totient is φ = 21003001101490.

The previous prime is 21003001101431. The next prime is 21003001101499. The reversal of 21003001101491 is 19410110030012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21003001101491 - 2¹⁴ = 21003001085107 is a prime.

It is a super-2 number, since 2×21003001101491² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003001101499) 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, 10501500550745 + 10501500550746.

It is an arithmetic number, because the mean of its divisors is an integer number (10501500550746).

Almost surely, 2^{21003001101491} is an apocalyptic number.

21003001101491 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003001101491 is an equidigital number, since it uses as much as digits as its factorization.

21003001101491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21003001101491 in words is "twenty-one trillion, three billion, one million, one hundred one thousand, four hundred ninety-one".