1210121201221 has 8 divisors (see below), whose sum is σ = 1221322403840. Its totient is φ = 1198921801968.

The previous prime is 1210121201119. The next prime is 1210121201239. The reversal of 1210121201221 is 1221021210121.

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 1210121201221 - 2¹¹ = 1210121199173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210121201195 and 1210121201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210121205221) 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, 916540 + ... + 1805626.

It is an arithmetic number, because the mean of its divisors is an integer number (152665300480).

Almost surely, 2^{1210121201221} is an apocalyptic number.

It is an amenable number.

1210121201221 is a deficient number, since it is larger than the sum of its proper divisors (11201202619).

1210121201221 is a wasteful number, since it uses less digits than its factorization.

1210121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901683.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1210121201221 its reverse (1221021210121), we get a palindrome (2431142411342).

The spelling of 1210121201221 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".