121210122211021 has 4 divisors (see below), whose sum is σ = 125120126153344. Its totient is φ = 117300118268700.

The previous prime is 121210122211001. The next prime is 121210122211043. The reversal of 121210122211021 is 120112221012121.

It is a happy number.

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 121210122211021 - 2⁹ = 121210122210509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121210122211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210122211001) 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, 1955001971115 + ... + 1955001971176.

It is an arithmetic number, because the mean of its divisors is an integer number (31280031538336).

Almost surely, 2^{121210122211021} is an apocalyptic number.

It is an amenable number.

121210122211021 is a deficient number, since it is larger than the sum of its proper divisors (3910003942323).

121210122211021 is an equidigital number, since it uses as much as digits as its factorization.

121210122211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910003942322.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121210122211021 its reverse (120112221012121), we get a palindrome (241322343223142).

The spelling of 121210122211021 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".