1211001121021 has 8 divisors (see below), whose sum is σ = 1250383801088. Its totient is φ = 1171638324000.

The previous prime is 1211001120991. The next prime is 1211001121039. The reversal of 1211001121021 is 1201211001121.

It is a happy number.

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 1211001121021 - 2⁹ = 1211001120509 is a prime.

It is a super-2 number, since 2×1211001121021² (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 = 1211001120992 and 1211001121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4846920 + ... + 5090641.

It is an arithmetic number, because the mean of its divisors is an integer number (156297975136).

Almost surely, 2^{1211001121021} is an apocalyptic number.

It is an amenable number.

1211001121021 is a deficient number, since it is larger than the sum of its proper divisors (39382680067).

1211001121021 is an equidigital number, since it uses as much as digits as its factorization.

1211001121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9941523.

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

Adding to 1211001121021 its reverse (1201211001121), we get a palindrome (2412212122142).

The spelling of 1211001121021 in words is "one trillion, two hundred eleven billion, one million, one hundred twenty-one thousand, twenty-one".