1211022011221 has 4 divisors (see below), whose sum is σ = 1321114921344. Its totient is φ = 1100929101100.

The previous prime is 1211022011219. The next prime is 1211022011293. The reversal of 1211022011221 is 1221102201121.

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 1211022011221 - 2¹ = 1211022011219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022011195 and 1211022011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022014221) 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, 55046455045 + ... + 55046455066.

It is an arithmetic number, because the mean of its divisors is an integer number (330278730336).

Almost surely, 2^{1211022011221} is an apocalyptic number.

1211022011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211022011221 is a deficient number, since it is larger than the sum of its proper divisors (110092910123).

1211022011221 is a wasteful number, since it uses less digits than its factorization.

1211022011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110092910122.

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

Adding to 1211022011221 its reverse (1221102201121), we get a palindrome (2432124212342).

The spelling of 1211022011221 in words is "one trillion, two hundred eleven billion, twenty-two million, eleven thousand, two hundred twenty-one".