21020031231311 has 8 divisors (see below), whose sum is σ = 24022920564000. Its totient is φ = 18017148830688.

The previous prime is 21020031231281. The next prime is 21020031231431. The reversal of 21020031231311 is 11313213002012.

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 21020031231311 - 2³⁰ = 21018957489487 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 (21020031231811) 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, 11101565 + ... + 12856313.

It is an arithmetic number, because the mean of its divisors is an integer number (3002865070500).

Almost surely, 2^{21020031231311} is an apocalyptic number.

21020031231311 is a deficient number, since it is larger than the sum of its proper divisors (3002889332689).

21020031231311 is a wasteful number, since it uses less digits than its factorization.

21020031231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466033.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21020031231311 its reverse (11313213002012), we get a palindrome (32333244233323).

The spelling of 21020031231311 in words is "twenty-one trillion, twenty billion, thirty-one million, two hundred thirty-one thousand, three hundred eleven".