1211101202021 has 4 divisors (see below), whose sum is σ = 1211408046912. Its totient is φ = 1210794357132.

The previous prime is 1211101202011. The next prime is 1211101202033. The reversal of 1211101202021 is 1202021011121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211101202021 - 2⁶ = 1211101201957 is a prime.

It is a super-2 number, since 2×1211101202021² (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 = 1211101201987 and 1211101202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101202011) 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, 153416525 + ... + 153424418.

It is an arithmetic number, because the mean of its divisors is an integer number (302852011728).

Almost surely, 2^{1211101202021} is an apocalyptic number.

It is an amenable number.

1211101202021 is a deficient number, since it is larger than the sum of its proper divisors (306844891).

1211101202021 is an equidigital number, since it uses as much as digits as its factorization.

1211101202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306844890.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211101202021 its reverse (1202021011121), we get a palindrome (2413122213142).

The spelling of 1211101202021 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred two thousand, twenty-one".