21301131331 has 4 divisors (see below), whose sum is σ = 21489637032. Its totient is φ = 21112625632.

The previous prime is 21301131263. The next prime is 21301131343. The reversal of 21301131331 is 13313110312.

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 21301131331 - 2¹³ = 21301123139 is a prime.

It is a super-2 number, since 2×21301131331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301131299 and 21301131308.

It is not an unprimeable number, because it can be changed into a prime (21301131031) 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, 94252681 + ... + 94252906.

It is an arithmetic number, because the mean of its divisors is an integer number (5372409258).

Almost surely, 2^21301131331 is an apocalyptic number.

21301131331 is a deficient number, since it is larger than the sum of its proper divisors (188505701).

21301131331 is a wasteful number, since it uses less digits than its factorization.

21301131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188505700.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21301131331 its reverse (13313110312), we get a palindrome (34614241643).

The spelling of 21301131331 in words is "twenty-one billion, three hundred one million, one hundred thirty-one thousand, three hundred thirty-one".