223121012291 has 2 divisors, whose sum is σ = 223121012292. Its totient is φ = 223121012290.

The previous prime is 223121012267. The next prime is 223121012381. The reversal of 223121012291 is 192210121322.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 223121012291 - 2²⁶ = 223053903427 is a prime.

It is a super-3 number, since 3×223121012291³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 223121012291.

It is not a weakly prime, because it can be changed into another prime (223121012201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111560506145 + 111560506146.

It is an arithmetic number, because the mean of its divisors is an integer number (111560506146).

Almost surely, 2^223121012291 is an apocalyptic number.

223121012291 is a deficient number, since it is larger than the sum of its proper divisors (1).

223121012291 is an equidigital number, since it uses as much as digits as its factorization.

223121012291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 223121012291 in words is "two hundred twenty-three billion, one hundred twenty-one million, twelve thousand, two hundred ninety-one".