1552222221 has 16 divisors (see below), whose sum is σ = 2261526528. Its totient is φ = 939178800.

The previous prime is 1552222219. The next prime is 1552222249. The reversal of 1552222221 is 1222222551.

It is not a de Polignac number, because 1552222221 - 2¹ = 1552222219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1552222191 and 1552222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1552222201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18715 + ... + 58776.

It is an arithmetic number, because the mean of its divisors is an integer number (141345408).

Almost surely, 2^1552222221 is an apocalyptic number.

1552222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1552222221 is a deficient number, since it is larger than the sum of its proper divisors (709304307).

1552222221 is a wasteful number, since it uses less digits than its factorization.

1552222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78112.

The product of its digits is 1600, while the sum is 24.

The square root of 1552222221 is about 39398.2514967352. The cubic root of 1552222221 is about 1157.8473307342.

Adding to 1552222221 its reverse (1222222551), we get a palindrome (2774444772).

The spelling of 1552222221 in words is "one billion, five hundred fifty-two million, two hundred twenty-two thousand, two hundred twenty-one".