21303711031 has 4 divisors (see below), whose sum is σ = 22424959000. Its totient is φ = 20182463064.

The previous prime is 21303710999. The next prime is 21303711049. The reversal of 21303711031 is 13011730312.

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 21303711031 - 2⁵ = 21303710999 is a prime.

It is a super-2 number, since 2×21303711031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21303710993 and 21303711011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303711071) 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, 560623956 + ... + 560623993.

It is an arithmetic number, because the mean of its divisors is an integer number (5606239750).

Almost surely, 2^21303711031 is an apocalyptic number.

21303711031 is a deficient number, since it is larger than the sum of its proper divisors (1121247969).

21303711031 is a wasteful number, since it uses less digits than its factorization.

21303711031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121247968.

The product of its (nonzero) digits is 378, while the sum is 22.

The spelling of 21303711031 in words is "twenty-one billion, three hundred three million, seven hundred eleven thousand, thirty-one".