21768414 has 32 divisors (see below), whose sum is σ = 46068480. Its totient is φ = 6838272.

The previous prime is 21768407. The next prime is 21768431. The reversal of 21768414 is 41486712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28927 + ... + 29669.

It is an arithmetic number, because the mean of its divisors is an integer number (1439640).

Almost surely, 2^21768414 is an apocalyptic number.

21768414 is an abundant number, since it is smaller than the sum of its proper divisors (24300066).

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

21768414 is a wasteful number, since it uses less digits than its factorization.

21768414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 10752, while the sum is 33.

The square root of 21768414 is about 4665.6632968957. The cubic root of 21768414 is about 279.2172611748.

The spelling of 21768414 in words is "twenty-one million, seven hundred sixty-eight thousand, four hundred fourteen".