21212110097 has 2 divisors, whose sum is σ = 21212110098. Its totient is φ = 21212110096.

The previous prime is 21212110063. The next prime is 21212110109. The reversal of 21212110097 is 79001121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12214449361 + 8997660736 = 110519^2 + 94856^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212110097 - 2¹² = 21212106001 is a prime.

It is a super-3 number, since 3×21212110097³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21212110057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606055048 + 10606055049.

It is an arithmetic number, because the mean of its divisors is an integer number (10606055049).

Almost surely, 2^21212110097 is an apocalyptic number.

It is an amenable number.

21212110097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212110097 is an equidigital number, since it uses as much as digits as its factorization.

21212110097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 21212110097 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, ninety-seven".