21340222012409 has 2 divisors, whose sum is σ = 21340222012410. Its totient is φ = 21340222012408.

The previous prime is 21340222012379. The next prime is 21340222012489. The reversal of 21340222012409 is 90421022204312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18988921786384 + 2351300226025 = 4357628^2 + 1533395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21340222012409 is a prime.

It is not a weakly prime, because it can be changed into another prime (21340222012489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670111006204 + 10670111006205.

It is an arithmetic number, because the mean of its divisors is an integer number (10670111006205).

Almost surely, 2^{21340222012409} is an apocalyptic number.

It is an amenable number.

21340222012409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340222012409 is an equidigital number, since it uses as much as digits as its factorization.

21340222012409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21340222012409 in words is "twenty-one trillion, three hundred forty billion, two hundred twenty-two million, twelve thousand, four hundred nine".