21255211151 has 2 divisors, whose sum is σ = 21255211152. Its totient is φ = 21255211150.

The previous prime is 21255211127. The next prime is 21255211157. The reversal of 21255211151 is 15111255212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21255211151 - 2¹⁴ = 21255194767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21255211151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21255211157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627605575 + 10627605576.

It is an arithmetic number, because the mean of its divisors is an integer number (10627605576).

Almost surely, 2^21255211151 is an apocalyptic number.

21255211151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255211151 is an equidigital number, since it uses as much as digits as its factorization.

21255211151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 26.

Adding to 21255211151 its reverse (15111255212), we get a palindrome (36366466363).

The spelling of 21255211151 in words is "twenty-one billion, two hundred fifty-five million, two hundred eleven thousand, one hundred fifty-one".