1221350245 has 8 divisors (see below), whose sum is σ = 1512898560. Its totient is φ = 945561360.

The previous prime is 1221350233. The next prime is 1221350269. The reversal of 1221350245 is 5420531221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221350245 - 2⁹ = 1221349733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3939685 + ... + 3939994.

It is an arithmetic number, because the mean of its divisors is an integer number (189112320).

Almost surely, 2^1221350245 is an apocalyptic number.

It is an amenable number.

1221350245 is a deficient number, since it is larger than the sum of its proper divisors (291548315).

1221350245 is an equidigital number, since it uses as much as digits as its factorization.

1221350245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879715.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1221350245 is about 34947.8217490018. The cubic root of 1221350245 is about 1068.9237861555.

Adding to 1221350245 its reverse (5420531221), we get a palindrome (6641881466).

The spelling of 1221350245 in words is "one billion, two hundred twenty-one million, three hundred fifty thousand, two hundred forty-five".