1221220201223 has 4 divisors (see below), whose sum is σ = 1332240219528. Its totient is φ = 1110200182920.

The previous prime is 1221220201219. The next prime is 1221220201231. The reversal of 1221220201223 is 3221020221221.

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 1221220201223 - 2² = 1221220201219 is a prime.

It is a super-2 number, since 2×1221220201223² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221220201195 and 1221220201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220201273) 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, 55510009136 + ... + 55510009157.

It is an arithmetic number, because the mean of its divisors is an integer number (333060054882).

Almost surely, 2^{1221220201223} is an apocalyptic number.

1221220201223 is a deficient number, since it is larger than the sum of its proper divisors (111020018305).

1221220201223 is a wasteful number, since it uses less digits than its factorization.

1221220201223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111020018304.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1221220201223 its reverse (3221020221221), we get a palindrome (4442240422444).

The spelling of 1221220201223 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred one thousand, two hundred twenty-three".