20311323121 has 8 divisors (see below), whose sum is σ = 21663088200. Its totient is φ = 18977000448.

The previous prime is 20311323113. The next prime is 20311323139. The reversal of 20311323121 is 12132311302.

It can be written as a sum of positive squares in 4 ways, for example, as 10453017600 + 9858305521 = 102240^2 + 99289^2 .

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

It is not a de Polignac number, because 20311323121 - 2³ = 20311323113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311323181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4358196 + ... + 4362853.

It is an arithmetic number, because the mean of its divisors is an integer number (2707886025).

Almost surely, 2^20311323121 is an apocalyptic number.

It is an amenable number.

20311323121 is a deficient number, since it is larger than the sum of its proper divisors (1351765079).

20311323121 is a wasteful number, since it uses less digits than its factorization.

20311323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8721203.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20311323121 its reverse (12132311302), we get a palindrome (32443634423).

The spelling of 20311323121 in words is "twenty billion, three hundred eleven million, three hundred twenty-three thousand, one hundred twenty-one".