21201330031 has 4 divisors (see below), whose sum is σ = 24230091472. Its totient is φ = 18172568592.

The previous prime is 21201329923. The next prime is 21201330047. The reversal of 21201330031 is 13003310212.

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 21201330031 - 2¹³ = 21201321839 is a prime.

It is a super-2 number, since 2×21201330031² (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 = 21201329987 and 21201330014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201340031) 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, 1514380710 + ... + 1514380723.

It is an arithmetic number, because the mean of its divisors is an integer number (6057522868).

Almost surely, 2^21201330031 is an apocalyptic number.

21201330031 is a deficient number, since it is larger than the sum of its proper divisors (3028761441).

21201330031 is an equidigital number, since it uses as much as digits as its factorization.

21201330031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028761440.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21201330031 its reverse (13003310212), we get a palindrome (34204640243).

The spelling of 21201330031 in words is "twenty-one billion, two hundred one million, three hundred thirty thousand, thirty-one".