1223400043221 has 32 divisors (see below), whose sum is σ = 1840131747840. Its totient is φ = 719104060224.

The previous prime is 1223400043211. The next prime is 1223400043247.

It is a happy number.

1223400043221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1223400043221 - 2¹¹ = 1223400041173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223400043191 and 1223400043200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223400043211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12562045 + ... + 12659058.

It is an arithmetic number, because the mean of its divisors is an integer number (57504117120).

Almost surely, 2^{1223400043221} is an apocalyptic number.

It is an amenable number.

1223400043221 is a deficient number, since it is larger than the sum of its proper divisors (616731704619).

1223400043221 is a wasteful number, since it uses less digits than its factorization.

1223400043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25221185.

The product of its (nonzero) digits is 2304, while the sum is 24.

It can be divided in two parts, 12234000 and 43221, that added together give a palindrome (12277221).

The spelling of 1223400043221 in words is "one trillion, two hundred twenty-three billion, four hundred million, forty-three thousand, two hundred twenty-one".