1220512240345 has 4 divisors (see below), whose sum is σ = 1464614688420. Its totient is φ = 976409792272.

The previous prime is 1220512240249. The next prime is 1220512240393. The reversal of 1220512240345 is 5430422150221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190149195721 + 1030363044624 = 436061^2 + 1015068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220512240345 - 2¹³ = 1220512232153 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122051224030 + ... + 122051224039.

It is an arithmetic number, because the mean of its divisors is an integer number (366153672105).

Almost surely, 2^{1220512240345} is an apocalyptic number.

It is an amenable number.

1220512240345 is a deficient number, since it is larger than the sum of its proper divisors (244102448075).

1220512240345 is an equidigital number, since it uses as much as digits as its factorization.

1220512240345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244102448074.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 1220512240345 its reverse (5430422150221), we get a palindrome (6650934390566).

The spelling of 1220512240345 in words is "one trillion, two hundred twenty billion, five hundred twelve million, two hundred forty thousand, three hundred forty-five".