121021222009 has 2 divisors, whose sum is σ = 121021222010. Its totient is φ = 121021222008.

The previous prime is 121021221977. The next prime is 121021222039. The reversal of 121021222009 is 900222120121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121020494400 + 727609 = 347880^2 + 853^2 .

It is an emirp because it is prime and its reverse (900222120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121021222009 - 2⁵ = 121021221977 is a prime.

It is a super-2 number, since 2×121021222009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121021222039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510611004 + 60510611005.

It is an arithmetic number, because the mean of its divisors is an integer number (60510611005).

Almost surely, 2^121021222009 is an apocalyptic number.

It is an amenable number.

121021222009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021222009 is an equidigital number, since it uses as much as digits as its factorization.

121021222009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 121021222009 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, nine".