21101320323 has 12 divisors (see below), whose sum is σ = 30996290520. Its totient is φ = 13829113536.

The previous prime is 21101320313. The next prime is 21101320327. The reversal of 21101320323 is 32302310112.

21101320323 is a `hidden beast` number, since 21 + 1 + 0 + 1 + 320 + 323 = 666.

It is not a de Polignac number, because 21101320323 - 2⁶ = 21101320259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101320296 and 21101320305.

It is not an unprimeable number, because it can be changed into a prime (21101320327) 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 11 ways as a sum of consecutive naturals, for example, 19868886 + ... + 19869947.

It is an arithmetic number, because the mean of its divisors is an integer number (2583024210).

Almost surely, 2^21101320323 is an apocalyptic number.

21101320323 is a deficient number, since it is larger than the sum of its proper divisors (9894970197).

21101320323 is a wasteful number, since it uses less digits than its factorization.

21101320323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39738898 (or 39738895 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21101320323 its reverse (32302310112), we get a palindrome (53403630435).

The spelling of 21101320323 in words is "twenty-one billion, one hundred one million, three hundred twenty thousand, three hundred twenty-three".