21031314234389 has 2 divisors, whose sum is σ = 21031314234390. Its totient is φ = 21031314234388.

The previous prime is 21031314234383. The next prime is 21031314234421. The reversal of 21031314234389 is 98343241313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19931385233764 + 1099929000625 = 4464458^2 + 1048775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031314234389 - 2¹⁶ = 21031314168853 is a prime.

It is a super-2 number, since 2×21031314234389² (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 (21031314234383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515657117194 + 10515657117195.

It is an arithmetic number, because the mean of its divisors is an integer number (10515657117195).

Almost surely, 2^{21031314234389} is an apocalyptic number.

It is an amenable number.

21031314234389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031314234389 is an equidigital number, since it uses as much as digits as its factorization.

21031314234389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 21031314234389 in words is "twenty-one trillion, thirty-one billion, three hundred fourteen million, two hundred thirty-four thousand, three hundred eighty-nine".