21354462062569 has 2 divisors, whose sum is σ = 21354462062570. Its totient is φ = 21354462062568.

The previous prime is 21354462062477. The next prime is 21354462062579. The reversal of 21354462062569 is 96526026445312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20868496922025 + 485965140544 = 4568205^2 + 697112^2 .

It is a cyclic number.

It is not a de Polignac number, because 21354462062569 - 2⁷ = 21354462062441 is a prime.

It is a super-4 number, since 4×21354462062569⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21354462062579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677231031284 + 10677231031285.

It is an arithmetic number, because the mean of its divisors is an integer number (10677231031285).

Almost surely, 2^{21354462062569} is an apocalyptic number.

It is an amenable number.

21354462062569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354462062569 is an equidigital number, since it uses as much as digits as its factorization.

21354462062569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 21354462062569 in words is "twenty-one trillion, three hundred fifty-four billion, four hundred sixty-two million, sixty-two thousand, five hundred sixty-nine".