21201303221971 has 2 divisors, whose sum is σ = 21201303221972. Its totient is φ = 21201303221970.

The previous prime is 21201303221939. The next prime is 21201303222017. The reversal of 21201303221971 is 17912230310212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201303221971 - 2⁵ = 21201303221939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201303221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600651610985 + 10600651610986.

It is an arithmetic number, because the mean of its divisors is an integer number (10600651610986).

Almost surely, 2^{21201303221971} is an apocalyptic number.

21201303221971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201303221971 is an equidigital number, since it uses as much as digits as its factorization.

21201303221971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 21201303221971 in words is "twenty-one trillion, two hundred one billion, three hundred three million, two hundred twenty-one thousand, nine hundred seventy-one".