121121000121221 has 16 divisors (see below), whose sum is σ = 129799159560000. Its totient is φ = 112615615020288.

The previous prime is 121121000121203. The next prime is 121121000121269. The reversal of 121121000121221 is 122121000121121.

It is a cyclic number.

It is not a de Polignac number, because 121121000121221 - 2¹⁴ = 121121000104837 is a prime.

It is a super-4 number, since 4×121121000121221⁴ (a number of 57 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 121121000121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121000120221) 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, 19496570 + ... + 24947108.

It is an arithmetic number, because the mean of its divisors is an integer number (8112447472500).

Almost surely, 2^{121121000121221} is an apocalyptic number.

It is an amenable number.

121121000121221 is a deficient number, since it is larger than the sum of its proper divisors (8678159438779).

121121000121221 is a wasteful number, since it uses less digits than its factorization.

121121000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5466388.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121121000121221 its reverse (122121000121121), we get a palindrome (243242000242342).

The spelling of 121121000121221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred twenty-one thousand, two hundred twenty-one".