21201112151 has 2 divisors, whose sum is σ = 21201112152. Its totient is φ = 21201112150.

The previous prime is 21201112139. The next prime is 21201112169. The reversal of 21201112151 is 15121110212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201112151 - 2⁶ = 21201112087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201115151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600556075 + 10600556076.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556076).

Almost surely, 2^21201112151 is an apocalyptic number.

21201112151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112151 is an equidigital number, since it uses as much as digits as its factorization.

21201112151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 21201112151 its reverse (15121110212), we get a palindrome (36322222363).

The spelling of 21201112151 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred fifty-one".