20131021311 has 8 divisors (see below), whose sum is σ = 26842187904. Its totient is φ = 13420267800.

The previous prime is 20131021307. The next prime is 20131021319. The reversal of 20131021311 is 11312013102.

It is a happy number.

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

It is not a de Polignac number, because 20131021311 - 2² = 20131021307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131021319) 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, 38086 + ... + 204236.

It is an arithmetic number, because the mean of its divisors is an integer number (3355273488).

Almost surely, 2^20131021311 is an apocalyptic number.

20131021311 is a deficient number, since it is larger than the sum of its proper divisors (6711166593).

20131021311 is a wasteful number, since it uses less digits than its factorization.

20131021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206541.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20131021311 its reverse (11312013102), we get a palindrome (31443034413).

The spelling of 20131021311 in words is "twenty billion, one hundred thirty-one million, twenty-one thousand, three hundred eleven".