21500235510151 has 2 divisors, whose sum is σ = 21500235510152. Its totient is φ = 21500235510150.

The previous prime is 21500235510133. The next prime is 21500235510161. The reversal of 21500235510151 is 15101553200512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21500235510151 - 2⁷ = 21500235510023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21500235510161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750117755075 + 10750117755076.

It is an arithmetic number, because the mean of its divisors is an integer number (10750117755076).

Almost surely, 2^{21500235510151} is an apocalyptic number.

21500235510151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21500235510151 is an equidigital number, since it uses as much as digits as its factorization.

21500235510151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 21500235510151 its reverse (15101553200512), we get a palindrome (36601788710663).

The spelling of 21500235510151 in words is "twenty-one trillion, five hundred billion, two hundred thirty-five million, five hundred ten thousand, one hundred fifty-one".