21031222220389 has 2 divisors, whose sum is σ = 21031222220390. Its totient is φ = 21031222220388.

The previous prime is 21031222220329. The next prime is 21031222220419. The reversal of 21031222220389 is 98302222213012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20553229743489 + 477992476900 = 4533567^2 + 691370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031222220389 - 2¹³ = 21031222212197 is a prime.

It is a super-2 number, since 2×21031222220389² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031222220329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515611110194 + 10515611110195.

It is an arithmetic number, because the mean of its divisors is an integer number (10515611110195).

Almost surely, 2^{21031222220389} is an apocalyptic number.

It is an amenable number.

21031222220389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031222220389 is an equidigital number, since it uses as much as digits as its factorization.

21031222220389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 21031222220389 in words is "twenty-one trillion, thirty-one billion, two hundred twenty-two million, two hundred twenty thousand, three hundred eighty-nine".