21412151 has 4 divisors (see below), whose sum is σ = 21910152. Its totient is φ = 20914152.

The previous prime is 21412133. The next prime is 21412177. The reversal of 21412151 is 15121412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21412151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248936 + ... + 249021.

It is an arithmetic number, because the mean of its divisors is an integer number (5477538).

Almost surely, 2^21412151 is an apocalyptic number.

21412151 is a deficient number, since it is larger than the sum of its proper divisors (498001).

21412151 is an equidigital number, since it uses as much as digits as its factorization.

21412151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498000.

The product of its digits is 80, while the sum is 17.

The square root of 21412151 is about 4627.3265499638. The cubic root of 21412151 is about 277.6856469514.

Adding to 21412151 its reverse (15121412), we get a palindrome (36533563).

The spelling of 21412151 in words is "twenty-one million, four hundred twelve thousand, one hundred fifty-one".