1220402231245 has 4 divisors (see below), whose sum is σ = 1464482677500. Its totient is φ = 976321784992.

The previous prime is 1220402231233. The next prime is 1220402231249. The reversal of 1220402231245 is 5421322040221.

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 738246979369 + 482155251876 = 859213^2 + 694374^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220402231245 - 2²⁹ = 1219865360333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220402231249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122040223120 + ... + 122040223129.

It is an arithmetic number, because the mean of its divisors is an integer number (366120669375).

Almost surely, 2^{1220402231245} is an apocalyptic number.

It is an amenable number.

1220402231245 is a deficient number, since it is larger than the sum of its proper divisors (244080446255).

1220402231245 is an equidigital number, since it uses as much as digits as its factorization.

1220402231245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244080446254.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 1220402231245 its reverse (5421322040221), we get a palindrome (6641724271466).

The spelling of 1220402231245 in words is "one trillion, two hundred twenty billion, four hundred two million, two hundred thirty-one thousand, two hundred forty-five".