121001001201 has 28 divisors (see below), whose sum is σ = 192090207492. Its totient is φ = 75922189056.

The previous prime is 121001001169. The next prime is 121001001211. The reversal of 121001001201 is 102100100121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 105326211600 + 15674789601 = 324540^2 + 125199^2 .

It is not a de Polignac number, because 121001001201 - 2⁵ = 121001001169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (121001001211) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4869436 + ... + 4894221.

Almost surely, 2^121001001201 is an apocalyptic number.

It is an amenable number.

121001001201 is a deficient number, since it is larger than the sum of its proper divisors (71089206291).

121001001201 is an frugal number, since it uses more digits than its factorization.

121001001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9763692 (or 9763677 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121001001201 its reverse (102100100121), we get a palindrome (223101101322).

It can be divided in two parts, 12100100120 and 1, that added together give a palindrome (12100100121).

The spelling of 121001001201 in words is "one hundred twenty-one billion, one million, one thousand, two hundred one".