1211021022011 has 4 divisors (see below), whose sum is σ = 1213911287400. Its totient is φ = 1208130756624.

The previous prime is 1211021021971. The next prime is 1211021022017. The reversal of 1211021022011 is 1102201201121.

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 1211021022011 - 2¹⁸ = 1211020759867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211021022017) 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, 1445132066 + ... + 1445132903.

It is an arithmetic number, because the mean of its divisors is an integer number (303477821850).

Almost surely, 2^{1211021022011} is an apocalyptic number.

1211021022011 is a deficient number, since it is larger than the sum of its proper divisors (2890265389).

1211021022011 is an equidigital number, since it uses as much as digits as its factorization.

1211021022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890265388.

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

Adding to 1211021022011 its reverse (1102201201121), we get a palindrome (2313222223132).

The spelling of 1211021022011 in words is "one trillion, two hundred eleven billion, twenty-one million, twenty-two thousand, eleven".