21152450551 has 2 divisors, whose sum is σ = 21152450552. Its totient is φ = 21152450550.

The previous prime is 21152450509. The next prime is 21152450567. The reversal of 21152450551 is 15505425112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21152450551 - 2¹¹ = 21152448503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21152450051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576225275 + 10576225276.

It is an arithmetic number, because the mean of its divisors is an integer number (10576225276).

Almost surely, 2^21152450551 is an apocalyptic number.

21152450551 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152450551 is an equidigital number, since it uses as much as digits as its factorization.

21152450551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 21152450551 its reverse (15505425112), we get a palindrome (36657875663).

The spelling of 21152450551 in words is "twenty-one billion, one hundred fifty-two million, four hundred fifty thousand, five hundred fifty-one".