21310111031 has 8 divisors (see below), whose sum is σ = 24614887824. Its totient is φ = 18233249920.

The previous prime is 21310111001. The next prime is 21310111033. The reversal of 21310111031 is 13011101312.

It is a happy number.

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 21310111031 - 2⁶ = 21310110967 is a prime.

It is a super-2 number, since 2×21310111031² (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 = 21310110997 and 21310111015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310111033) 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, 56978720 + ... + 56979093.

It is an arithmetic number, because the mean of its divisors is an integer number (3076860978).

Almost surely, 2^21310111031 is an apocalyptic number.

21310111031 is a deficient number, since it is larger than the sum of its proper divisors (3304776793).

21310111031 is a wasteful number, since it uses less digits than its factorization.

21310111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113957841.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21310111031 its reverse (13011101312), we get a palindrome (34321212343).

The spelling of 21310111031 in words is "twenty-one billion, three hundred ten million, one hundred eleven thousand, thirty-one".