21002102122097 has 2 divisors, whose sum is σ = 21002102122098. Its totient is φ = 21002102122096.

The previous prime is 21002102122091. The next prime is 21002102122103. The reversal of 21002102122097 is 79022120120012.

It is a balanced prime because it is at equal distance from previous prime (21002102122091) and next prime (21002102122103).

It can be written as a sum of positive squares in only one way, i.e., 15293175601201 + 5708926520896 = 3910649^2 + 2389336^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002102122097 - 2¹⁰ = 21002102121073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002102122091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501051061048 + 10501051061049.

It is an arithmetic number, because the mean of its divisors is an integer number (10501051061049).

Almost surely, 2^{21002102122097} is an apocalyptic number.

It is an amenable number.

21002102122097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002102122097 is an equidigital number, since it uses as much as digits as its factorization.

21002102122097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 21002102122097 in words is "twenty-one trillion, two billion, one hundred two million, one hundred twenty-two thousand, ninety-seven".