1221707235 has 16 divisors (see below), whose sum is σ = 2233979136. Its totient is φ = 558494688.

The previous prime is 1221707219. The next prime is 1221707269. The reversal of 1221707235 is 5327071221.

It is not a de Polignac number, because 1221707235 - 2⁴ = 1221707219 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5817549 + ... + 5817758.

It is an arithmetic number, because the mean of its divisors is an integer number (139623696).

Almost surely, 2^1221707235 is an apocalyptic number.

1221707235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221707235 is a deficient number, since it is larger than the sum of its proper divisors (1012271901).

1221707235 is a wasteful number, since it uses less digits than its factorization.

1221707235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11635322.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 1221707235 is about 34952.9288472368. The cubic root of 1221707235 is about 1069.0279217030.

Adding to 1221707235 its reverse (5327071221), we get a palindrome (6548778456).

The spelling of 1221707235 in words is "one billion, two hundred twenty-one million, seven hundred seven thousand, two hundred thirty-five".