1211120221021 has 4 divisors (see below), whose sum is σ = 1211146340544. Its totient is φ = 1211094101500.

The previous prime is 1211120221001. The next prime is 1211120221049. The reversal of 1211120221021 is 1201220211121.

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 a de Polignac number, because none of the positive numbers 2^k-1211120221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211120220986 and 1211120221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211120221001) 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, 12990085 + ... + 13082986.

It is an arithmetic number, because the mean of its divisors is an integer number (302786585136).

Almost surely, 2^{1211120221021} is an apocalyptic number.

It is an amenable number.

1211120221021 is a deficient number, since it is larger than the sum of its proper divisors (26119523).

1211120221021 is an equidigital number, since it uses as much as digits as its factorization.

1211120221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26119522.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211120221021 its reverse (1201220211121), we get a palindrome (2412340432142).

The spelling of 1211120221021 in words is "one trillion, two hundred eleven billion, one hundred twenty million, two hundred twenty-one thousand, twenty-one".