21032101031 has 4 divisors (see below), whose sum is σ = 21600536232. Its totient is φ = 20463665832.

The previous prime is 21032101007. The next prime is 21032101037. The reversal of 21032101031 is 13010123012.

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

It is a cyclic number.

It is not a de Polignac number, because 21032101031 - 2⁶ = 21032100967 is a prime.

It is a super-2 number, since 2×21032101031² (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 = 21032100997 and 21032101015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032101037) 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, 284217545 + ... + 284217618.

It is an arithmetic number, because the mean of its divisors is an integer number (5400134058).

Almost surely, 2^21032101031 is an apocalyptic number.

21032101031 is a deficient number, since it is larger than the sum of its proper divisors (568435201).

21032101031 is an equidigital number, since it uses as much as digits as its factorization.

21032101031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568435200.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21032101031 its reverse (13010123012), we get a palindrome (34042224043).

The spelling of 21032101031 in words is "twenty-one billion, thirty-two million, one hundred one thousand, thirty-one".