21103001031 has 16 divisors (see below), whose sum is σ = 32166355968. Its totient is φ = 12055332000.

The previous prime is 21103001027. The next prime is 21103001077. The reversal of 21103001031 is 13010030112.

It is not a de Polignac number, because 21103001031 - 2² = 21103001027 is a prime.

It is a super-2 number, since 2×21103001031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21103000998 and 21103001016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103001011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72495 + ... + 217856.

It is an arithmetic number, because the mean of its divisors is an integer number (2010397248).

Almost surely, 2^21103001031 is an apocalyptic number.

21103001031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21103001031 is a deficient number, since it is larger than the sum of its proper divisors (11063354937).

21103001031 is a wasteful number, since it uses less digits than its factorization.

21103001031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293822.

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

Adding to 21103001031 its reverse (13010030112), we get a palindrome (34113031143).

The spelling of 21103001031 in words is "twenty-one billion, one hundred three million, one thousand, thirty-one".