201321100978 has 8 divisors (see below), whose sum is σ = 303727210668. Its totient is φ = 100078697424.

The previous prime is 201321100931. The next prime is 201321100979. The reversal of 201321100978 is 879001123102.

It can be written as a sum of positive squares in 2 ways, for example, as 179154953289 + 22166147689 = 423267^2 + 148883^2 .

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

It is not an unprimeable number, because it can be changed into a prime (201321100979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290926101 + ... + 290926792.

Almost surely, 2^201321100978 is an apocalyptic number.

201321100978 is a deficient number, since it is larger than the sum of its proper divisors (102406109690).

201321100978 is a wasteful number, since it uses less digits than its factorization.

201321100978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581853068.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 201321100978 in words is "two hundred one billion, three hundred twenty-one million, one hundred thousand, nine hundred seventy-eight".