1215021223445 has 16 divisors (see below), whose sum is σ = 1521513348480. Its totient is φ = 929697029184.

The previous prime is 1215021223439. The next prime is 1215021223447. The reversal of 1215021223445 is 5443221205121.

It is a cyclic number.

It is not a de Polignac number, because 1215021223445 - 2¹⁴ = 1215021207061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215021223447) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1555667 + ... + 2202303.

It is an arithmetic number, because the mean of its divisors is an integer number (95094584280).

Almost surely, 2^{1215021223445} is an apocalyptic number.

It is an amenable number.

1215021223445 is a deficient number, since it is larger than the sum of its proper divisors (306492125035).

1215021223445 is a wasteful number, since it uses less digits than its factorization.

1215021223445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663004.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 1215021223445 its reverse (5443221205121), we get a palindrome (6658242428566).

The spelling of 1215021223445 in words is "one trillion, two hundred fifteen billion, twenty-one million, two hundred twenty-three thousand, four hundred forty-five".