121211121201 has 16 divisors (see below), whose sum is σ = 171153425088. Its totient is φ = 76039884800.

The previous prime is 121211121173. The next prime is 121211121203. The reversal of 121211121201 is 102121112121.

It is a happy number.

It is not a de Polignac number, because 121211121201 - 2¹⁷ = 121210990129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211121203) 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, 59086 + ... + 495896.

It is an arithmetic number, because the mean of its divisors is an integer number (10697089068).

Almost surely, 2^121211121201 is an apocalyptic number.

It is an amenable number.

121211121201 is a deficient number, since it is larger than the sum of its proper divisors (49942303887).

121211121201 is a wasteful number, since it uses less digits than its factorization.

121211121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442272.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121211121201 its reverse (102121112121), we get a palindrome (223332233322).

It can be divided in two parts, 12121112120 and 1, that added together give a palindrome (12121112121).

The spelling of 121211121201 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred one".