21221120220031 has 2 divisors, whose sum is σ = 21221120220032. Its totient is φ = 21221120220030.

The previous prime is 21221120219989. The next prime is 21221120220049. The reversal of 21221120220031 is 13002202112212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221120220031 - 2⁷ = 21221120219903 is a prime.

It is a super-2 number, since 2×21221120220031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221120219990 and 21221120220008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221120220331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610560110015 + 10610560110016.

It is an arithmetic number, because the mean of its divisors is an integer number (10610560110016).

Almost surely, 2^{21221120220031} is an apocalyptic number.

21221120220031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221120220031 is an equidigital number, since it uses as much as digits as its factorization.

21221120220031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21221120220031 its reverse (13002202112212), we get a palindrome (34223322332243).

The spelling of 21221120220031 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty thousand, thirty-one".