121211222021 has 8 divisors (see below), whose sum is σ = 121745122200. Its totient is φ = 120677439232.

The previous prime is 121211221997. The next prime is 121211222023. The reversal of 121211222021 is 120222112121.

It can be written as a sum of positive squares in 4 ways, for example, as 4357320100 + 116853901921 = 66010^2 + 341839^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121211222021 - 2²² = 121207027717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211222023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527361 + ... + 2574873.

It is an arithmetic number, because the mean of its divisors is an integer number (15218140275).

Almost surely, 2^121211222021 is an apocalyptic number.

It is an amenable number.

121211222021 is a deficient number, since it is larger than the sum of its proper divisors (533900179).

121211222021 is a wasteful number, since it uses less digits than its factorization.

121211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58695.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121211222021 its reverse (120222112121), we get a palindrome (241433334142).

The spelling of 121211222021 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".