21223210213031 has 4 divisors (see below), whose sum is σ = 21223222277832. Its totient is φ = 21223198148232.

The previous prime is 21223210213019. The next prime is 21223210213033. The reversal of 21223210213031 is 13031201232212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21223210213031 - 2³⁴ = 21206030343847 is a prime.

It is a super-2 number, since 2×21223210213031² (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 = 21223210212988 and 21223210213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223210213033) 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, 2825456 + ... + 7101381.

It is an arithmetic number, because the mean of its divisors is an integer number (5305805569458).

Almost surely, 2^{21223210213031} is an apocalyptic number.

21223210213031 is a deficient number, since it is larger than the sum of its proper divisors (12064801).

21223210213031 is an equidigital number, since it uses as much as digits as its factorization.

21223210213031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12064800.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21223210213031 its reverse (13031201232212), we get a palindrome (34254411445243).

The spelling of 21223210213031 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred ten million, two hundred thirteen thousand, thirty-one".