1001212021111 has 4 divisors (see below), whose sum is σ = 1001322162424. Its totient is φ = 1001101879800.

The previous prime is 1001212021109. The next prime is 1001212021157. The reversal of 1001212021111 is 1111202121001.

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 1001212021111 - 2¹ = 1001212021109 is a prime.

It is a super-2 number, since 2×1001212021111² (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 = 1001212021091 and 1001212021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212021171) 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, 55057020 + ... + 55075201.

It is an arithmetic number, because the mean of its divisors is an integer number (250330540606).

Almost surely, 2^{1001212021111} is an apocalyptic number.

1001212021111 is a deficient number, since it is larger than the sum of its proper divisors (110141313).

1001212021111 is an equidigital number, since it uses as much as digits as its factorization.

1001212021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110141312.

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

Adding to 1001212021111 its reverse (1111202121001), we get a palindrome (2112414142112).

The spelling of 1001212021111 in words is "one trillion, one billion, two hundred twelve million, twenty-one thousand, one hundred eleven".