21155001151 has 2 divisors, whose sum is σ = 21155001152. Its totient is φ = 21155001150.

The previous prime is 21155001107. The next prime is 21155001181. The reversal of 21155001151 is 15110055112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21155001151 - 2²⁵ = 21121446719 is a prime.

It is a super-2 number, since 2×21155001151² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21155001181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577500575 + 10577500576.

It is an arithmetic number, because the mean of its divisors is an integer number (10577500576).

Almost surely, 2^21155001151 is an apocalyptic number.

21155001151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155001151 is an equidigital number, since it uses as much as digits as its factorization.

21155001151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 22.

Adding to 21155001151 its reverse (15110055112), we get a palindrome (36265056263).

The spelling of 21155001151 in words is "twenty-one billion, one hundred fifty-five million, one thousand, one hundred fifty-one".