21202101219997 has 2 divisors, whose sum is σ = 21202101219998. Its totient is φ = 21202101219996.

The previous prime is 21202101219983. The next prime is 21202101220007. The reversal of 21202101219997 is 79991210120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12584976195961 + 8617125024036 = 3547531^2 + 2935494^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202101219997 - 2³⁹ = 20652345406109 is a prime.

It is a super-2 number, since 2×21202101219997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202101219977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050609998 + 10601050609999.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050609999).

Almost surely, 2^{21202101219997} is an apocalyptic number.

It is an amenable number.

21202101219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202101219997 is an equidigital number, since it uses as much as digits as its factorization.

21202101219997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 21202101219997 in words is "twenty-one trillion, two hundred two billion, one hundred one million, two hundred nineteen thousand, nine hundred ninety-seven".