20311343221 has 16 divisors (see below), whose sum is σ = 22098061440. Its totient is φ = 18556868160.

The previous prime is 20311343167. The next prime is 20311343231. The reversal of 20311343221 is 12234311302.

It is a cyclic number.

It is not a de Polignac number, because 20311343221 - 2¹¹ = 20311341173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20311343192 and 20311343201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311343231) 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, 3771951 + ... + 3777331.

It is an arithmetic number, because the mean of its divisors is an integer number (1381128840).

Almost surely, 2^20311343221 is an apocalyptic number.

It is an amenable number.

20311343221 is a deficient number, since it is larger than the sum of its proper divisors (1786718219).

20311343221 is a wasteful number, since it uses less digits than its factorization.

20311343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8316.

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

Adding to 20311343221 its reverse (12234311302), we get a palindrome (32545654523).

It can be divided in two parts, 203 and 11343221, that added together give a square (11343424 = 3368²).

The spelling of 20311343221 in words is "twenty billion, three hundred eleven million, three hundred forty-three thousand, two hundred twenty-one".