223040621261 has 4 divisors (see below), whose sum is σ = 223238178300. Its totient is φ = 222843064224.

The previous prime is 223040621233. The next prime is 223040621317. The reversal of 223040621261 is 162126040322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162126040322 = 2 ⋅81063020161.

It can be written as a sum of positive squares in 2 ways, for example, as 7623036100 + 215417585161 = 87310^2 + 464131^2 .

It is a cyclic number.

It is not a de Polignac number, because 223040621261 - 2¹⁰ = 223040620237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223040621201) 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, 98776826 + ... + 98779083.

It is an arithmetic number, because the mean of its divisors is an integer number (55809544575).

Almost surely, 2^223040621261 is an apocalyptic number.

It is an amenable number.

223040621261 is a deficient number, since it is larger than the sum of its proper divisors (197557039).

223040621261 is a wasteful number, since it uses less digits than its factorization.

223040621261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197557038.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 223040621261 its reverse (162126040322), we get a palindrome (385166661583).

The spelling of 223040621261 in words is "two hundred twenty-three billion, forty million, six hundred twenty-one thousand, two hundred sixty-one".