223154404120421 has 2 divisors, whose sum is σ = 223154404120422. Its totient is φ = 223154404120420.

The previous prime is 223154404120393. The next prime is 223154404120451. The reversal of 223154404120421 is 124021404451322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196587739950625 + 26566664169796 = 14020975^2 + 5154286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223154404120421 is a prime.

It is a super-3 number, since 3×223154404120421³ (a number of 44 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223154404120451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111577202060210 + 111577202060211.

It is an arithmetic number, because the mean of its divisors is an integer number (111577202060211).

Almost surely, 2^{223154404120421} is an apocalyptic number.

It is an amenable number.

223154404120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

223154404120421 is an equidigital number, since it uses as much as digits as its factorization.

223154404120421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 223154404120421 its reverse (124021404451322), we get a palindrome (347175808571743).

The spelling of 223154404120421 in words is "two hundred twenty-three trillion, one hundred fifty-four billion, four hundred four million, one hundred twenty thousand, four hundred twenty-one".