20311105621 has 4 divisors (see below), whose sum is σ = 21380111200. Its totient is φ = 19242100044.

The previous prime is 20311105603. The next prime is 20311105651. The reversal of 20311105621 is 12650111302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12650111302 = 2 ⋅6325055651.

It is a cyclic number.

It is not a de Polignac number, because 20311105621 - 2¹⁵ = 20311072853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20311105592 and 20311105601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311105651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534502761 + ... + 534502798.

It is an arithmetic number, because the mean of its divisors is an integer number (5345027800).

Almost surely, 2^20311105621 is an apocalyptic number.

It is an amenable number.

20311105621 is a deficient number, since it is larger than the sum of its proper divisors (1069005579).

20311105621 is a wasteful number, since it uses less digits than its factorization.

20311105621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069005578.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 20311105621 its reverse (12650111302), we get a palindrome (32961216923).

The spelling of 20311105621 in words is "twenty billion, three hundred eleven million, one hundred five thousand, six hundred twenty-one".