121211101001 has 4 divisors (see below), whose sum is σ = 121212322500. Its totient is φ = 121209879504.

The previous prime is 121211100991. The next prime is 121211101009. The reversal of 121211101001 is 100101112121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103275463225 + 17935637776 = 321365^2 + 133924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121211101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211101009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447326 + ... + 665223.

It is an arithmetic number, because the mean of its divisors is an integer number (30303080625).

Almost surely, 2^121211101001 is an apocalyptic number.

It is an amenable number.

121211101001 is a deficient number, since it is larger than the sum of its proper divisors (1221499).

121211101001 is a wasteful number, since it uses less digits than its factorization.

121211101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221498.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 121211101001 its reverse (100101112121), we get a palindrome (221312213122).

The spelling of 121211101001 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred one thousand, one".