225211207121 has 4 divisors (see below), whose sum is σ = 226221123072. Its totient is φ = 224201291172.

The previous prime is 225211207103. The next prime is 225211207129. The reversal of 225211207121 is 121702112522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225211207121 is a prime.

It is a super-2 number, since 2×225211207121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225211207129) 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, 504957641 + ... + 504958086.

It is an arithmetic number, because the mean of its divisors is an integer number (56555280768).

Almost surely, 2^225211207121 is an apocalyptic number.

It is an amenable number.

225211207121 is a deficient number, since it is larger than the sum of its proper divisors (1009915951).

225211207121 is a wasteful number, since it uses less digits than its factorization.

225211207121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009915950.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 225211207121 its reverse (121702112522), we get a palindrome (346913319643).

The spelling of 225211207121 in words is "two hundred twenty-five billion, two hundred eleven million, two hundred seven thousand, one hundred twenty-one".