21546342127253 has 2 divisors, whose sum is σ = 21546342127254. Its totient is φ = 21546342127252.

The previous prime is 21546342127241. The next prime is 21546342127327. The reversal of 21546342127253 is 35272124364512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19744363432369 + 1801978694884 = 4443463^2 + 1342378^2 .

It is a cyclic number.

It is not a de Polignac number, because 21546342127253 - 2³⁸ = 21271464220309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21546342127198 and 21546342127207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21546342127213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10773171063626 + 10773171063627.

It is an arithmetic number, because the mean of its divisors is an integer number (10773171063627).

Almost surely, 2^{21546342127253} is an apocalyptic number.

It is an amenable number.

21546342127253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21546342127253 is an equidigital number, since it uses as much as digits as its factorization.

21546342127253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 47.

The spelling of 21546342127253 in words is "twenty-one trillion, five hundred forty-six billion, three hundred forty-two million, one hundred twenty-seven thousand, two hundred fifty-three".