1554224221 has 8 divisors (see below), whose sum is σ = 1696737600. Its totient is φ = 1411914240.

The previous prime is 1554224179. The next prime is 1554224251. The reversal of 1554224221 is 1224224551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1554224221 is a prime.

It is a super-2 number, since 2×1554224221² = 4831225858286113682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1554224221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554224251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34641 + ... + 65638.

It is an arithmetic number, because the mean of its divisors is an integer number (212092200).

Almost surely, 2^1554224221 is an apocalyptic number.

1554224221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1554224221 is a deficient number, since it is larger than the sum of its proper divisors (142513379).

1554224221 is a wasteful number, since it uses less digits than its factorization.

1554224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101699.

The product of its digits is 6400, while the sum is 28.

The square root of 1554224221 is about 39423.6505285850. The cubic root of 1554224221 is about 1158.3449000633.

Adding to 1554224221 its reverse (1224224551), we get a palindrome (2778448772).

The spelling of 1554224221 in words is "one billion, five hundred fifty-four million, two hundred twenty-four thousand, two hundred twenty-one".