21452401651 has 2 divisors, whose sum is σ = 21452401652. Its totient is φ = 21452401650.

The previous prime is 21452401637. The next prime is 21452401673. The reversal of 21452401651 is 15610425412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21452401651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21452401351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726200825 + 10726200826.

It is an arithmetic number, because the mean of its divisors is an integer number (10726200826).

Almost surely, 2^21452401651 is an apocalyptic number.

21452401651 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452401651 is an equidigital number, since it uses as much as digits as its factorization.

21452401651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 21452401651 in words is "twenty-one billion, four hundred fifty-two million, four hundred one thousand, six hundred fifty-one".