21122103031 has 4 divisors (see below), whose sum is σ = 21126480064. Its totient is φ = 21117726000.

The previous prime is 21122103029. The next prime is 21122103109. The reversal of 21122103031 is 13030122112.

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 21122103031 - 2¹ = 21122103029 is a prime.

It is a super-2 number, since 2×21122103031² (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 = 21122102996 and 21122103014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122100031) 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, 2181270 + ... + 2190931.

It is an arithmetic number, because the mean of its divisors is an integer number (5281620016).

Almost surely, 2^21122103031 is an apocalyptic number.

21122103031 is a deficient number, since it is larger than the sum of its proper divisors (4377033).

21122103031 is an equidigital number, since it uses as much as digits as its factorization.

21122103031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377032.

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

Adding to 21122103031 its reverse (13030122112), we get a palindrome (34152225143).

The spelling of 21122103031 in words is "twenty-one billion, one hundred twenty-two million, one hundred three thousand, thirty-one".