215391940990 has 64 divisors (see below), whose sum is σ = 404692485120. Its totient is φ = 82437264000.

The previous prime is 215391940969. The next prime is 215391940997. The reversal of 215391940990 is 99049193512.

215391940990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215391940997) 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 31 ways as a sum of consecutive naturals, for example, 30806395 + ... + 30813385.

It is an arithmetic number, because the mean of its divisors is an integer number (6323320080).

Almost surely, 2^215391940990 is an apocalyptic number.

215391940990 is a deficient number, since it is larger than the sum of its proper divisors (189300544130).

215391940990 is a wasteful number, since it uses less digits than its factorization.

215391940990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7969.

The product of its (nonzero) digits is 787320, while the sum is 52.

The spelling of 215391940990 in words is "two hundred fifteen billion, three hundred ninety-one million, nine hundred forty thousand, nine hundred ninety".