1221030355 has 16 divisors (see below), whose sum is σ = 1604927520. Its totient is φ = 887660032.

The previous prime is 1221030331. The next prime is 1221030359. The reversal of 1221030355 is 5530301221.

It is not a de Polignac number, because 1221030355 - 2¹¹ = 1221028307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221030359) 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, 245209 + ... + 250138.

It is an arithmetic number, because the mean of its divisors is an integer number (100307970).

Almost surely, 2^1221030355 is an apocalyptic number.

1221030355 is a deficient number, since it is larger than the sum of its proper divisors (383897165).

1221030355 is a wasteful number, since it uses less digits than its factorization.

1221030355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495398.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1221030355 is about 34943.2447691968. The cubic root of 1221030355 is about 1068.8304556009.

Adding to 1221030355 its reverse (5530301221), we get a palindrome (6751331576).

The spelling of 1221030355 in words is "one billion, two hundred twenty-one million, thirty thousand, three hundred fifty-five".