21203100031 has 8 divisors (see below), whose sum is σ = 21583346400. Its totient is φ = 20826009600.

The previous prime is 21203100011. The next prime is 21203100047. The reversal of 21203100031 is 13000130212.

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 21203100031 - 2¹³ = 21203091839 is a prime.

It is a super-2 number, since 2×21203100031² (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 = 21203099984 and 21203100020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203100011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775426 + ... + 802303.

It is an arithmetic number, because the mean of its divisors is an integer number (2697918300).

Almost surely, 2^21203100031 is an apocalyptic number.

21203100031 is a deficient number, since it is larger than the sum of its proper divisors (380246369).

21203100031 is a wasteful number, since it uses less digits than its factorization.

21203100031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577969.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21203100031 its reverse (13000130212), we get a palindrome (34203230243).

The spelling of 21203100031 in words is "twenty-one billion, two hundred three million, one hundred thousand, thirty-one".