21265151 has 2 divisors, whose sum is σ = 21265152. Its totient is φ = 21265150.

The previous prime is 21265129. The next prime is 21265159. The reversal of 21265151 is 15156212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21265151 - 2²² = 17070847 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21265159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632575 + 10632576.

It is an arithmetic number, because the mean of its divisors is an integer number (10632576).

Almost surely, 2^21265151 is an apocalyptic number.

21265151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21265151 is an equidigital number, since it uses as much as digits as its factorization.

21265151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 23.

The square root of 21265151 is about 4611.4152925105. The cubic root of 21265151 is about 277.0487257183.

The spelling of 21265151 in words is "twenty-one million, two hundred sixty-five thousand, one hundred fifty-one".