21031140031 has 8 divisors (see below), whose sum is σ = 22944986064. Its totient is φ = 19117614720.

The previous prime is 21031140029. The next prime is 21031140043. The reversal of 21031140031 is 13004113012.

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 21031140031 - 2¹ = 21031140029 is a prime.

It is a super-2 number, since 2×21031140031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21031139987 and 21031140014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031140331) 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, 69015 + ... + 216391.

It is an arithmetic number, because the mean of its divisors is an integer number (2868123258).

Almost surely, 2^21031140031 is an apocalyptic number.

21031140031 is a deficient number, since it is larger than the sum of its proper divisors (1913846033).

21031140031 is a wasteful number, since it uses less digits than its factorization.

21031140031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160361.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21031140031 its reverse (13004113012), we get a palindrome (34035253043).

The spelling of 21031140031 in words is "twenty-one billion, thirty-one million, one hundred forty thousand, thirty-one".