21152361264427 has 2 divisors, whose sum is σ = 21152361264428. Its totient is φ = 21152361264426.

The previous prime is 21152361264341. The next prime is 21152361264451. The reversal of 21152361264427 is 72446216325112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21152361264427 - 2¹⁹ = 21152360740139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152361264467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576180632213 + 10576180632214.

It is an arithmetic number, because the mean of its divisors is an integer number (10576180632214).

Almost surely, 2^{21152361264427} is an apocalyptic number.

21152361264427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152361264427 is an equidigital number, since it uses as much as digits as its factorization.

21152361264427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 46.

Adding to 21152361264427 its reverse (72446216325112), we get a palindrome (93598577589539).

The spelling of 21152361264427 in words is "twenty-one trillion, one hundred fifty-two billion, three hundred sixty-one million, two hundred sixty-four thousand, four hundred twenty-seven".