20111202321 has 16 divisors (see below), whose sum is σ = 30652162944. Its totient is φ = 11489670144.

The previous prime is 20111202311. The next prime is 20111202329. The reversal of 20111202321 is 12320211102.

It is not a de Polignac number, because 20111202321 - 2¹¹ = 20111200273 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111202321.

It is not an unprimeable number, because it can be changed into a prime (20111202329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1585 + ... + 200561.

It is an arithmetic number, because the mean of its divisors is an integer number (1915760184).

Almost surely, 2^20111202321 is an apocalyptic number.

20111202321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20111202321 is a deficient number, since it is larger than the sum of its proper divisors (10540960623).

20111202321 is a wasteful number, since it uses less digits than its factorization.

20111202321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203800.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20111202321 its reverse (12320211102), we get a palindrome (32431413423).

The spelling of 20111202321 in words is "twenty billion, one hundred eleven million, two hundred two thousand, three hundred twenty-one".