215450021012 has 12 divisors (see below), whose sum is σ = 379216945716. Its totient is φ = 107102322240.

The previous prime is 215450021011. The next prime is 215450021041. The reversal of 215450021012 is 210120054512.

It can be written as a sum of positive squares in 2 ways, for example, as 184518357136 + 30931663876 = 429556^2 + 175874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215450021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155671289 + ... + 155672672.

It is an arithmetic number, because the mean of its divisors is an integer number (31601412143).

Almost surely, 2^215450021012 is an apocalyptic number.

It is an amenable number.

215450021012 is a deficient number, since it is larger than the sum of its proper divisors (163766924704).

215450021012 is a wasteful number, since it uses less digits than its factorization.

215450021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311344138 (or 311344136 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 215450021012 its reverse (210120054512), we get a palindrome (425570075524).

The spelling of 215450021012 in words is "two hundred fifteen billion, four hundred fifty million, twenty-one thousand, twelve".