21031001031 has 8 divisors (see below), whose sum is σ = 28161684720. Its totient is φ = 13960492352.

The previous prime is 21031000973. The next prime is 21031001039. The reversal of 21031001031 is 13010013012.

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 21031001031 - 2¹⁴ = 21030984647 is a prime.

It is a super-2 number, since 2×21031001031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031000998 and 21031001016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031001039) 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, 15042936 + ... + 15044333.

It is an arithmetic number, because the mean of its divisors is an integer number (3520210590).

Almost surely, 2^21031001031 is an apocalyptic number.

21031001031 is a deficient number, since it is larger than the sum of its proper divisors (7130683689).

21031001031 is a wasteful number, since it uses less digits than its factorization.

21031001031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30087505.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21031001031 its reverse (13010013012), we get a palindrome (34041014043).

The spelling of 21031001031 in words is "twenty-one billion, thirty-one million, one thousand, thirty-one".