20115221345 has 32 divisors (see below), whose sum is σ = 24993792000. Its totient is φ = 15533968320.

The previous prime is 20115221341. The next prime is 20115221363. The reversal of 20115221345 is 54312251102.

It is not a de Polignac number, because 20115221345 - 2² = 20115221341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20115221341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4448996 + ... + 4453514.

It is an arithmetic number, because the mean of its divisors is an integer number (781056000).

Almost surely, 2^20115221345 is an apocalyptic number.

It is an amenable number.

20115221345 is a deficient number, since it is larger than the sum of its proper divisors (4878570655).

20115221345 is a wasteful number, since it uses less digits than its factorization.

20115221345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4853.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20115221345 its reverse (54312251102), we get a palindrome (74427472447).

The spelling of 20115221345 in words is "twenty billion, one hundred fifteen million, two hundred twenty-one thousand, three hundred forty-five".