1221202355 has 16 divisors (see below), whose sum is σ = 1505679840. Its totient is φ = 950479872.

The previous prime is 1221202351. The next prime is 1221202391. The reversal of 1221202355 is 5532021221.

It is a cyclic number.

It is not a de Polignac number, because 1221202355 - 2² = 1221202351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221202355.

It is not an unprimeable number, because it can be changed into a prime (1221202351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7277 + ... + 49953.

It is an arithmetic number, because the mean of its divisors is an integer number (94104990).

Almost surely, 2^1221202355 is an apocalyptic number.

1221202355 is a deficient number, since it is larger than the sum of its proper divisors (284477485).

1221202355 is an equidigital number, since it uses as much as digits as its factorization.

1221202355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42838.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1221202355 is about 34945.7058163088. The cubic root of 1221202355 is about 1068.8806400499.

Adding to 1221202355 its reverse (5532021221), we get a palindrome (6753223576).

The spelling of 1221202355 in words is "one billion, two hundred twenty-one million, two hundred two thousand, three hundred fifty-five".