21310612289 has 2 divisors, whose sum is σ = 21310612290. Its totient is φ = 21310612288.

The previous prime is 21310612273. The next prime is 21310612331. The reversal of 21310612289 is 98221601312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12020929600 + 9289682689 = 109640^2 + 96383^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310612289 - 2⁴ = 21310612273 is a prime.

It is a super-2 number, since 2×21310612289² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21310614289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655306144 + 10655306145.

It is an arithmetic number, because the mean of its divisors is an integer number (10655306145).

Almost surely, 2^21310612289 is an apocalyptic number.

It is an amenable number.

21310612289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310612289 is an equidigital number, since it uses as much as digits as its factorization.

21310612289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21310612289 in words is "twenty-one billion, three hundred ten million, six hundred twelve thousand, two hundred eighty-nine".