121210221001 has 4 divisors (see below), whose sum is σ = 121238160400. Its totient is φ = 121182281604.

The previous prime is 121210220959. The next prime is 121210221029. The reversal of 121210221001 is 100122012121.

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 121210221001 - 2¹⁵ = 121210188233 is a prime.

It is a super-2 number, since 2×121210221001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121210221071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13963191 + ... + 13971868.

It is an arithmetic number, because the mean of its divisors is an integer number (30309540100).

Almost surely, 2^121210221001 is an apocalyptic number.

It is an amenable number.

121210221001 is a deficient number, since it is larger than the sum of its proper divisors (27939399).

121210221001 is an equidigital number, since it uses as much as digits as its factorization.

121210221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27939398.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121210221001 its reverse (100122012121), we get a palindrome (221332233122).

It can be divided in two parts, 121 and 210221001, that multiplied together give a square (25436741121 = 159489²).

The spelling of 121210221001 in words is "one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one".