21303111031 has 8 divisors (see below), whose sum is σ = 21397380480. Its totient is φ = 21209012448.

The previous prime is 21303111019. The next prime is 21303111103. The reversal of 21303111031 is 13011130312.

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

It is a cyclic number.

It is not a de Polignac number, because 21303111031 - 2⁷ = 21303110903 is a prime.

It is a super-2 number, since 2×21303111031² (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 = 21303110996 and 21303111014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303171031) 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, 210490 + ... + 294808.

It is an arithmetic number, because the mean of its divisors is an integer number (2674672560).

Almost surely, 2^21303111031 is an apocalyptic number.

21303111031 is a deficient number, since it is larger than the sum of its proper divisors (94269449).

21303111031 is an equidigital number, since it uses as much as digits as its factorization.

21303111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85433.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21303111031 its reverse (13011130312), we get a palindrome (34314241343).

The spelling of 21303111031 in words is "twenty-one billion, three hundred three million, one hundred eleven thousand, thirty-one".