21149710 has 8 divisors (see below), whose sum is σ = 38069496. Its totient is φ = 8459880.

The previous prime is 21149699. The next prime is 21149731. The reversal of 21149710 is 1794112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057476 + ... + 1057495.

It is an arithmetic number, because the mean of its divisors is an integer number (4758687).

Almost surely, 2^21149710 is an apocalyptic number.

21149710 is a deficient number, since it is larger than the sum of its proper divisors (16919786).

21149710 is a wasteful number, since it uses less digits than its factorization.

21149710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114978.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21149710 is about 4598.8813857285. The cubic root of 21149710 is about 276.5464825328.

The spelling of 21149710 in words is "twenty-one million, one hundred forty-nine thousand, seven hundred ten".