21849151 has 8 divisors (see below), whose sum is σ = 22654800. Its totient is φ = 21047040.

The previous prime is 21849137. The next prime is 21849161. The reversal of 21849151 is 15194812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21849151 - 2⁹ = 21848639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23055 + ... + 23983.

It is an arithmetic number, because the mean of its divisors is an integer number (2831850).

Almost surely, 2^21849151 is an apocalyptic number.

21849151 is a deficient number, since it is larger than the sum of its proper divisors (805649).

21849151 is an equidigital number, since it uses as much as digits as its factorization.

21849151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its digits is 2880, while the sum is 31.

The square root of 21849151 is about 4674.3075422997. The cubic root of 21849151 is about 279.5620321373.

The spelling of 21849151 in words is "twenty-one million, eight hundred forty-nine thousand, one hundred fifty-one".