228551421 has 12 divisors (see below), whose sum is σ = 348374432. Its totient is φ = 130561224.

The previous prime is 228551419. The next prime is 228551443. The reversal of 228551421 is 124155822.

It is not a de Polignac number, because 228551421 - 2¹ = 228551419 is a prime.

It is a super-2 number, since 2×228551421² = 104471504082238482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228551221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67630 + ... + 70928.

Almost surely, 2^228551421 is an apocalyptic number.

228551421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

228551421 is a deficient number, since it is larger than the sum of its proper divisors (119823011).

228551421 is an frugal number, since it uses more digits than its factorization.

228551421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6608 (or 3309 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

The square root of 228551421 is about 15117.9172176593. The cubic root of 228551421 is about 611.4035770694.

The spelling of 228551421 in words is "two hundred twenty-eight million, five hundred fifty-one thousand, four hundred twenty-one".