1001212121011 has 4 divisors (see below), whose sum is σ = 1004080924000. Its totient is φ = 998343318024.

The previous prime is 1001212120949. The next prime is 1001212121017. The reversal of 1001212121011 is 1101212121001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1001212121011 - 2¹³ = 1001212112819 is a prime.

It is a super-2 number, since 2×1001212121011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001212120982 and 1001212121000.

It is not an unprimeable number, because it can be changed into a prime (1001212121017) 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, 1434400971 + ... + 1434401668.

It is an arithmetic number, because the mean of its divisors is an integer number (251020231000).

Almost surely, 2^{1001212121011} is an apocalyptic number.

1001212121011 is a deficient number, since it is larger than the sum of its proper divisors (2868802989).

1001212121011 is an equidigital number, since it uses as much as digits as its factorization.

1001212121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868802988.

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

Adding to 1001212121011 its reverse (1101212121001), we get a palindrome (2102424242012).

The spelling of 1001212121011 in words is "one trillion, one billion, two hundred twelve million, one hundred twenty-one thousand, eleven".