21420130302491 has 2 divisors, whose sum is σ = 21420130302492. Its totient is φ = 21420130302490.

The previous prime is 21420130302419. The next prime is 21420130302499. The reversal of 21420130302491 is 19420303102412.

Together with previous prime (21420130302419) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21420130302491 - 2²² = 21420126108187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21420130302499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710065151245 + 10710065151246.

It is an arithmetic number, because the mean of its divisors is an integer number (10710065151246).

Almost surely, 2^{21420130302491} is an apocalyptic number.

21420130302491 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420130302491 is an equidigital number, since it uses as much as digits as its factorization.

21420130302491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21420130302491 in words is "twenty-one trillion, four hundred twenty billion, one hundred thirty million, three hundred two thousand, four hundred ninety-one".