1355050221 has 16 divisors (see below), whose sum is σ = 2154614784. Its totient is φ = 740648304.

The previous prime is 1355050219. The next prime is 1355050231. The reversal of 1355050221 is 1220505531.

It is a happy number.

It is not a de Polignac number, because 1355050221 - 2¹ = 1355050219 is a prime.

It is a super-2 number, since 2×1355050221² = 3672322202864297682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1355050191 and 1355050200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355050231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1402261 + ... + 1403226.

It is an arithmetic number, because the mean of its divisors is an integer number (134663424).

Almost surely, 2^1355050221 is an apocalyptic number.

It is an amenable number.

1355050221 is a deficient number, since it is larger than the sum of its proper divisors (799564563).

1355050221 is a wasteful number, since it uses less digits than its factorization.

1355050221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805520.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 1355050221 is about 36811.0067914476. The cubic root of 1355050221 is about 1106.5858956126.

Adding to 1355050221 its reverse (1220505531), we get a palindrome (2575555752).

The spelling of 1355050221 in words is "one billion, three hundred fifty-five million, fifty thousand, two hundred twenty-one".