10121221097 has 4 divisors (see below), whose sum is σ = 10899776580. Its totient is φ = 9342665616.

The previous prime is 10121221049. The next prime is 10121221111. The reversal of 10121221097 is 79012212101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2026440256 + 8094780841 = 45016^2 + 89971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10121221097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121221697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389277722 + ... + 389277747.

It is an arithmetic number, because the mean of its divisors is an integer number (2724944145).

Almost surely, 2^10121221097 is an apocalyptic number.

It is an amenable number.

10121221097 is a deficient number, since it is larger than the sum of its proper divisors (778555483).

10121221097 is an equidigital number, since it uses as much as digits as its factorization.

10121221097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778555482.

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

Adding to 10121221097 its reverse (79012212101), we get a palindrome (89133433198).

The spelling of 10121221097 in words is "ten billion, one hundred twenty-one million, two hundred twenty-one thousand, ninety-seven".