121221221001 has 4 divisors (see below), whose sum is σ = 161628294672. Its totient is φ = 80814147332.

The previous prime is 121221220961. The next prime is 121221221021. The reversal of 121221221001 is 100122122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121221221001 - 2⁷ = 121221220873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221221021) 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, 20203536831 + ... + 20203536836.

It is an arithmetic number, because the mean of its divisors is an integer number (40407073668).

Almost surely, 2^121221221001 is an apocalyptic number.

It is an amenable number.

121221221001 is a deficient number, since it is larger than the sum of its proper divisors (40407073671).

121221221001 is an equidigital number, since it uses as much as digits as its factorization.

121221221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40407073670.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221221001 its reverse (100122122121), we get a palindrome (221343343122).

The spelling of 121221221001 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, one".