20311221001103 has 4 divisors (see below), whose sum is σ = 21380232632760. Its totient is φ = 19242209369448.

The previous prime is 20311221001081. The next prime is 20311221001111. The reversal of 20311221001103 is 30110012211302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20311221001103 - 2¹⁶ = 20311220935567 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 (20311221004103) 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, 534505815800 + ... + 534505815837.

It is an arithmetic number, because the mean of its divisors is an integer number (5345058158190).

Almost surely, 2^{20311221001103} is an apocalyptic number.

20311221001103 is a deficient number, since it is larger than the sum of its proper divisors (1069011631657).

20311221001103 is a wasteful number, since it uses less digits than its factorization.

20311221001103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069011631656.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20311221001103 its reverse (30110012211302), we get a palindrome (50421233212405).

The spelling of 20311221001103 in words is "twenty trillion, three hundred eleven billion, two hundred twenty-one million, one thousand, one hundred three".