1210211100001 has 2 divisors, whose sum is σ = 1210211100002. Its totient is φ = 1210211100000.

The previous prime is 1210211099963. The next prime is 1210211100011. The reversal of 1210211100001 is 1000011120121.

It is an a-pointer prime, because the next prime (1210211100011) can be obtained adding 1210211100001 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034502581025 + 175708518976 = 1017105^2 + 419176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210211100001 - 2³⁷ = 1072772146529 is a prime.

It is a super-2 number, since 2×1210211100001² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1210211100011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605105550000 + 605105550001.

It is an arithmetic number, because the mean of its divisors is an integer number (605105550001).

Almost surely, 2^{1210211100001} is an apocalyptic number.

It is an amenable number.

1210211100001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210211100001 is an equidigital number, since it uses as much as digits as its factorization.

1210211100001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1210211100001 its reverse (1000011120121), we get a palindrome (2210222220122).

The spelling of 1210211100001 in words is "one trillion, two hundred ten billion, two hundred eleven million, one hundred thousand, one".