21402213089 has 2 divisors, whose sum is σ = 21402213090. Its totient is φ = 21402213088.

The previous prime is 21402213083. The next prime is 21402213113. The reversal of 21402213089 is 98031220412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21112090000 + 290123089 = 145300^2 + 17033^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402213089 - 2¹⁶ = 21402147553 is a prime.

It is not a weakly prime, because it can be changed into another prime (21402213083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701106544 + 10701106545.

It is an arithmetic number, because the mean of its divisors is an integer number (10701106545).

Almost surely, 2^21402213089 is an apocalyptic number.

It is an amenable number.

21402213089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402213089 is an equidigital number, since it uses as much as digits as its factorization.

21402213089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 21402213089 in words is "twenty-one billion, four hundred two million, two hundred thirteen thousand, eighty-nine".