1534223221 has 4 divisors (see below), whose sum is σ = 1587127500. Its totient is φ = 1481318944.

The previous prime is 1534223183. The next prime is 1534223233. The reversal of 1534223221 is 1223224351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223224351 = 19 ⋅64380229.

It can be written as a sum of positive squares in 2 ways, for example, as 707028100 + 827195121 = 26590^2 + 28761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1534223221 - 2⁹ = 1534222709 is a prime.

It is a super-2 number, since 2×1534223221² = 4707681783711229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1534223921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26452096 + ... + 26452153.

It is an arithmetic number, because the mean of its divisors is an integer number (396781875).

Almost surely, 2^1534223221 is an apocalyptic number.

It is an amenable number.

1534223221 is a deficient number, since it is larger than the sum of its proper divisors (52904279).

1534223221 is an equidigital number, since it uses as much as digits as its factorization.

1534223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52904278.

The product of its digits is 2880, while the sum is 25.

The square root of 1534223221 is about 39169.1616070602. The cubic root of 1534223221 is about 1153.3545959211.

Adding to 1534223221 its reverse (1223224351), we get a palindrome (2757447572).

The spelling of 1534223221 in words is "one billion, five hundred thirty-four million, two hundred twenty-three thousand, two hundred twenty-one".