225722421 has 6 divisors (see below), whose sum is σ = 326043510. Its totient is φ = 150481608.

The previous prime is 225722411. The next prime is 225722429. The reversal of 225722421 is 124227522.

It can be written as a sum of positive squares in only one way, i.e., 221682321 + 4040100 = 14889^2 + 2010^2 .

It is not a de Polignac number, because 225722421 - 2⁷ = 225722293 is a prime.

It is a super-2 number, since 2×225722421² = 101901222684202482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225722429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12540126 + ... + 12540143.

It is an arithmetic number, because the mean of its divisors is an integer number (54340585).

Almost surely, 2^225722421 is an apocalyptic number.

It is an amenable number.

225722421 is a deficient number, since it is larger than the sum of its proper divisors (100321089).

225722421 is a wasteful number, since it uses less digits than its factorization.

225722421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25080275 (or 25080272 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 225722421 is about 15024.0614016317. The cubic root of 225722421 is about 608.8704538123.

Adding to 225722421 its reverse (124227522), we get a palindrome (349949943).

The spelling of 225722421 in words is "two hundred twenty-five million, seven hundred twenty-two thousand, four hundred twenty-one".