226401021 has 96 divisors (see below), whose sum is σ = 436008960. Its totient is φ = 114760800.

The previous prime is 226401013. The next prime is 226401023. The reversal of 226401021 is 120104622.

226401021 is a `hidden beast` number, since 2 + 2 + 640 + 1 + 0 + 21 = 666.

It is not a de Polignac number, because 226401021 - 2³ = 226401013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 226400985 and 226401003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226401023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 683826 + ... + 684156.

It is an arithmetic number, because the mean of its divisors is an integer number (4541760).

Almost surely, 2^226401021 is an apocalyptic number.

226401021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

226401021 is a deficient number, since it is larger than the sum of its proper divisors (209607939).

226401021 is a wasteful number, since it uses less digits than its factorization.

226401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 226401021 is about 15046.6282269484. The cubic root of 226401021 is about 609.4800020716.

Adding to 226401021 its reverse (120104622), we get a palindrome (346505643).

The spelling of 226401021 in words is "two hundred twenty-six million, four hundred one thousand, twenty-one".