21671514 has 24 divisors (see below), whose sum is σ = 49427040. Its totient is φ = 6843528.

The previous prime is 21671513. The next prime is 21671521. The reversal of 21671514 is 41517612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21671513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31342 + ... + 32025.

It is an arithmetic number, because the mean of its divisors is an integer number (2059460).

Almost surely, 2^21671514 is an apocalyptic number.

21671514 is an abundant number, since it is smaller than the sum of its proper divisors (27755526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21671514 is a wasteful number, since it uses less digits than its factorization.

21671514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63394 (or 63391 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 21671514 is about 4655.2673392621. The cubic root of 21671514 is about 278.8023419844.

The spelling of 21671514 in words is "twenty-one million, six hundred seventy-one thousand, five hundred fourteen".