21213231289 has 2 divisors, whose sum is σ = 21213231290. Its totient is φ = 21213231288.

The previous prime is 21213231241. The next prime is 21213231337. The reversal of 21213231289 is 98213231212.

It is a balanced prime because it is at equal distance from previous prime (21213231241) and next prime (21213231337).

It can be written as a sum of positive squares in only one way, i.e., 18135200889 + 3078030400 = 134667^2 + 55480^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213231289 - 2⁷ = 21213231161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213231209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606615644 + 10606615645.

It is an arithmetic number, because the mean of its divisors is an integer number (10606615645).

Almost surely, 2^21213231289 is an apocalyptic number.

It is an amenable number.

21213231289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213231289 is an equidigital number, since it uses as much as digits as its factorization.

21213231289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The spelling of 21213231289 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred eighty-nine".