121201212210121 has 16 divisors (see below), whose sum is σ = 122865020135424. Its totient is φ = 119548527848064.

The previous prime is 121201212210103. The next prime is 121201212210173. The reversal of 121201212210121 is 121012212102121.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201212210121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121201212210101) 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, 1353962061 + ... + 1354051573.

It is an arithmetic number, because the mean of its divisors is an integer number (7679063758464).

Almost surely, 2^{121201212210121} is an apocalyptic number.

It is an amenable number.

121201212210121 is a deficient number, since it is larger than the sum of its proper divisors (1663807925303).

121201212210121 is a wasteful number, since it uses less digits than its factorization.

121201212210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151440.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121201212210121 its reverse (121012212102121), we get a palindrome (242213424312242).

The spelling of 121201212210121 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred twelve million, two hundred ten thousand, one hundred twenty-one".