20431021011 has 4 divisors (see below), whose sum is σ = 27241361352. Its totient is φ = 13620680672.

The previous prime is 20431021007. The next prime is 20431021097. The reversal of 20431021011 is 11012013402.

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 20431021011 - 2² = 20431021007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20431021111) 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, 3405170166 + ... + 3405170171.

It is an arithmetic number, because the mean of its divisors is an integer number (6810340338).

Almost surely, 2^20431021011 is an apocalyptic number.

20431021011 is a deficient number, since it is larger than the sum of its proper divisors (6810340341).

20431021011 is an equidigital number, since it uses as much as digits as its factorization.

20431021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810340340.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20431021011 its reverse (11012013402), we get a palindrome (31443034413).

The spelling of 20431021011 in words is "twenty billion, four hundred thirty-one million, twenty-one thousand, eleven".