21345511032389 has 2 divisors, whose sum is σ = 21345511032390. Its totient is φ = 21345511032388.

The previous prime is 21345511032371. The next prime is 21345511032533. The reversal of 21345511032389 is 98323011554312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13552396724164 + 7793114308225 = 3681358^2 + 2791615^2 .

It is a cyclic number.

It is not a de Polignac number, because 21345511032389 - 2²⁸ = 21345242596933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21345511032089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672755516194 + 10672755516195.

It is an arithmetic number, because the mean of its divisors is an integer number (10672755516195).

Almost surely, 2^{21345511032389} is an apocalyptic number.

It is an amenable number.

21345511032389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21345511032389 is an equidigital number, since it uses as much as digits as its factorization.

21345511032389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 21345511032389 in words is "twenty-one trillion, three hundred forty-five billion, five hundred eleven million, thirty-two thousand, three hundred eighty-nine".