1225121722513 has 8 divisors (see below), whose sum is σ = 1319417409128. Its totient is φ = 1130833972224.

The previous prime is 1225121722499. The next prime is 1225121722549. The reversal of 1225121722513 is 3152271215221.

It can be written as a sum of positive squares in 4 ways, for example, as 371767014529 + 853354707984 = 609727^2 + 923772^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225121722513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225121722313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1661520 + ... + 2282737.

It is an arithmetic number, because the mean of its divisors is an integer number (164927176141).

Almost surely, 2^{1225121722513} is an apocalyptic number.

1225121722513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1225121722513 is a deficient number, since it is larger than the sum of its proper divisors (94295686615).

1225121722513 is a wasteful number, since it uses less digits than its factorization.

1225121722513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968163.

The product of its digits is 16800, while the sum is 34.

Adding to 1225121722513 its reverse (3152271215221), we get a palindrome (4377392937734).

The spelling of 1225121722513 in words is "one trillion, two hundred twenty-five billion, one hundred twenty-one million, seven hundred twenty-two thousand, five hundred thirteen".