21000022203031 has 4 divisors (see below), whose sum is σ = 21000044688064. Its totient is φ = 20999999718000.

The previous prime is 21000022203001. The next prime is 21000022203071. The reversal of 21000022203031 is 13030222000012.

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 21000022203031 - 2³¹ = 20997874719383 is a prime.

It is a super-2 number, since 2×21000022203031² (a number of 27 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 = 21000022202996 and 21000022203014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000022203001) 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, 9777990 + ... + 11730691.

It is an arithmetic number, because the mean of its divisors is an integer number (5250011172016).

Almost surely, 2^{21000022203031} is an apocalyptic number.

21000022203031 is a deficient number, since it is larger than the sum of its proper divisors (22485033).

21000022203031 is an equidigital number, since it uses as much as digits as its factorization.

21000022203031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22485032.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21000022203031 its reverse (13030222000012), we get a palindrome (34030244203043).

The spelling of 21000022203031 in words is "twenty-one trillion, twenty-two million, two hundred three thousand, thirty-one".