1021011221211 has 4 divisors (see below), whose sum is σ = 1361348294952. Its totient is φ = 680674147472.

The previous prime is 1021011221207. The next prime is 1021011221231. The reversal of 1021011221211 is 1121221101201.

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 1021011221211 - 2² = 1021011221207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021011221201) 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, 170168536866 + ... + 170168536871.

It is an arithmetic number, because the mean of its divisors is an integer number (340337073738).

Almost surely, 2^{1021011221211} is an apocalyptic number.

1021011221211 is a deficient number, since it is larger than the sum of its proper divisors (340337073741).

1021011221211 is an equidigital number, since it uses as much as digits as its factorization.

1021011221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340337073740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1021011221211 its reverse (1121221101201), we get a palindrome (2142232322412).

The spelling of 1021011221211 in words is "one trillion, twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred eleven".