20081321107 has 4 divisors (see below), whose sum is σ = 20204519560. Its totient is φ = 19958122656.

The previous prime is 20081321101. The next prime is 20081321123. The reversal of 20081321107 is 70112318002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20081321107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20081321101) 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, 61598982 + ... + 61599307.

It is an arithmetic number, because the mean of its divisors is an integer number (5051129890).

Almost surely, 2^20081321107 is an apocalyptic number.

20081321107 is a deficient number, since it is larger than the sum of its proper divisors (123198453).

20081321107 is a wasteful number, since it uses less digits than its factorization.

20081321107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123198452.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 20081321107 its reverse (70112318002), we get a palindrome (90193639109).

The spelling of 20081321107 in words is "twenty billion, eighty-one million, three hundred twenty-one thousand, one hundred seven".