101001211001 has 4 divisors (see below), whose sum is σ = 101003132004. Its totient is φ = 100999290000.

The previous prime is 101001210923. The next prime is 101001211007. The reversal of 101001211001 is 100112100101.

It is a happy number.

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 30651605776 + 70349605225 = 175076^2 + 265235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101001211001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101001211001.

It is not an unprimeable number, because it can be changed into a prime (101001211007) 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, 879350 + ... + 987551.

It is an arithmetic number, because the mean of its divisors is an integer number (25250783001).

Almost surely, 2^101001211001 is an apocalyptic number.

It is an amenable number.

101001211001 is a deficient number, since it is larger than the sum of its proper divisors (1921003).

101001211001 is an equidigital number, since it uses as much as digits as its factorization.

101001211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921002.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 101001211001 its reverse (100112100101), we get a palindrome (201113311102).

The spelling of 101001211001 in words is "one hundred one billion, one million, two hundred eleven thousand, one".