121122121211021 has 16 divisors (see below), whose sum is σ = 141345762854784. Its totient is φ = 101649361653504.

The previous prime is 121122121210969. The next prime is 121122121211027. The reversal of 121122121211021 is 120112121221121.

It is a happy number.

It is not a de Polignac number, because 121122121211021 - 2⁶ = 121122121210957 is a prime.

It is a super-2 number, since 2×121122121211021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121122121210984 and 121122121211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122121211027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 865001495 + ... + 865141508.

It is an arithmetic number, because the mean of its divisors is an integer number (8834110178424).

Almost surely, 2^{121122121211021} is an apocalyptic number.

It is an amenable number.

121122121211021 is a deficient number, since it is larger than the sum of its proper divisors (20223641643763).

121122121211021 is a wasteful number, since it uses less digits than its factorization.

121122121211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730143220.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121122121211021 its reverse (120112121221121), we get a palindrome (241234242432142).

The spelling of 121122121211021 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".