21321013111 has 8 divisors (see below), whose sum is σ = 21496817664. Its totient is φ = 21145332600.

The previous prime is 21321013099. The next prime is 21321013157. The reversal of 21321013111 is 11131012312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321013111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321013211) 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 7 ways as a sum of consecutive naturals, for example, 331536 + ... + 390586.

It is an arithmetic number, because the mean of its divisors is an integer number (2687102208).

Almost surely, 2^21321013111 is an apocalyptic number.

21321013111 is a deficient number, since it is larger than the sum of its proper divisors (175804553).

21321013111 is a wasteful number, since it uses less digits than its factorization.

21321013111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62021.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21321013111 its reverse (11131012312), we get a palindrome (32452025423).

The spelling of 21321013111 in words is "twenty-one billion, three hundred twenty-one million, thirteen thousand, one hundred eleven".