121221022002121 has 4 divisors (see below), whose sum is σ = 121221052728592. Its totient is φ = 121220991275652.

The previous prime is 121221022002097. The next prime is 121221022002131. The reversal of 121221022002121 is 121200220122121.

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 121221022002121 - 2³¹ = 121218874518473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221022002131) 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, 8390655 + ... + 17687428.

It is an arithmetic number, because the mean of its divisors is an integer number (30305263182148).

Almost surely, 2^{121221022002121} is an apocalyptic number.

It is an amenable number.

121221022002121 is a deficient number, since it is larger than the sum of its proper divisors (30726471).

121221022002121 is an equidigital number, since it uses as much as digits as its factorization.

121221022002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30726470.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221022002121 its reverse (121200220122121), we get a palindrome (242421242124242).

The spelling of 121221022002121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, two thousand, one hundred twenty-one".