1211011022021 has 4 divisors (see below), whose sum is σ = 1211466463200. Its totient is φ = 1210555580844.

The previous prime is 1211011022017. The next prime is 1211011022027. The reversal of 1211011022021 is 1202201101121.

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 1211011022021 - 2² = 1211011022017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211011021987 and 1211011022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211011022027) 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 3 ways as a sum of consecutive naturals, for example, 227716601 + ... + 227721918.

It is an arithmetic number, because the mean of its divisors is an integer number (302866615800).

Almost surely, 2^{1211011022021} is an apocalyptic number.

It is an amenable number.

1211011022021 is a deficient number, since it is larger than the sum of its proper divisors (455441179).

1211011022021 is an equidigital number, since it uses as much as digits as its factorization.

1211011022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455441178.

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

Adding to 1211011022021 its reverse (1202201101121), we get a palindrome (2413212123142).

The spelling of 1211011022021 in words is "one trillion, two hundred eleven billion, eleven million, twenty-two thousand, twenty-one".