21030301031 has 4 divisors (see below), whose sum is σ = 22137159000. Its totient is φ = 19923443064.

The previous prime is 21030300979. The next prime is 21030301037. The reversal of 21030301031 is 13010303012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030301031 is a prime.

It is a super-2 number, since 2×21030301031² (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 = 21030300997 and 21030301015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030301037) 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, 553428956 + ... + 553428993.

It is an arithmetic number, because the mean of its divisors is an integer number (5534289750).

Almost surely, 2^21030301031 is an apocalyptic number.

21030301031 is a deficient number, since it is larger than the sum of its proper divisors (1106857969).

21030301031 is a wasteful number, since it uses less digits than its factorization.

21030301031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106857968.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21030301031 its reverse (13010303012), we get a palindrome (34040604043).

The spelling of 21030301031 in words is "twenty-one billion, thirty million, three hundred one thousand, thirty-one".