21323432011 has 16 divisors (see below), whose sum is σ = 25314632640. Its totient is φ = 17573713920.

The previous prime is 21323431973. The next prime is 21323432029. The reversal of 21323432011 is 11023432312.

It is not a de Polignac number, because 21323432011 - 2²⁵ = 21289877579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323432051) 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, 169006 + ... + 266851.

It is an arithmetic number, because the mean of its divisors is an integer number (1582164540).

Almost surely, 2^21323432011 is an apocalyptic number.

21323432011 is a deficient number, since it is larger than the sum of its proper divisors (3991200629).

21323432011 is a wasteful number, since it uses less digits than its factorization.

21323432011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436134.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21323432011 its reverse (11023432312), we get a palindrome (32346864323).

The spelling of 21323432011 in words is "twenty-one billion, three hundred twenty-three million, four hundred thirty-two thousand, eleven".