21221303213031 has 4 divisors (see below), whose sum is σ = 28295070950712. Its totient is φ = 14147535475352.

The previous prime is 21221303212943. The next prime is 21221303213057. The reversal of 21221303213031 is 13031230312212.

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 21221303213031 - 2⁹ = 21221303212519 is a prime.

It is a super-2 number, since 2×21221303213031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221303212992 and 21221303213010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221303215031) 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, 3536883868836 + ... + 3536883868841.

It is an arithmetic number, because the mean of its divisors is an integer number (7073767737678).

Almost surely, 2^{21221303213031} is an apocalyptic number.

21221303213031 is a deficient number, since it is larger than the sum of its proper divisors (7073767737681).

21221303213031 is an equidigital number, since it uses as much as digits as its factorization.

21221303213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073767737680.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21221303213031 its reverse (13031230312212), we get a palindrome (34252533525243).

The spelling of 21221303213031 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred three million, two hundred thirteen thousand, thirty-one".