1212211101001 has 8 divisors (see below), whose sum is σ = 1284202943784. Its totient is φ = 1140295403520.

The previous prime is 1212211100987. The next prime is 1212211101041. The reversal of 1212211101001 is 1001011122121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 129989091600 + 1082222009401 = 360540^2 + 1040299^2 .

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 1212211101001 - 2⁹ = 1212211100489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212211101041) 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, 19003540 + ... + 19067221.

It is an arithmetic number, because the mean of its divisors is an integer number (160525367973).

Almost surely, 2^{1212211101001} is an apocalyptic number.

It is an amenable number.

1212211101001 is a deficient number, since it is larger than the sum of its proper divisors (71991842783).

1212211101001 is a wasteful number, since it uses less digits than its factorization.

1212211101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38072651.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212211101001 its reverse (1001011122121), we get a palindrome (2213222223122).

The spelling of 1212211101001 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred one thousand, one".