21771514 has 8 divisors (see below), whose sum is σ = 32678100. Its totient is φ = 10878816.

The previous prime is 21771487. The next prime is 21771521. The reversal of 21771514 is 41517712.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 840889 = 4575^2 + 917^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2512 + ... + 7060.

Almost surely, 2^21771514 is an apocalyptic number.

21771514 is a deficient number, since it is larger than the sum of its proper divisors (10906586).

21771514 is a wasteful number, since it uses less digits than its factorization.

21771514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944.

The product of its digits is 1960, while the sum is 28.

The square root of 21771514 is about 4665.9954993549. The cubic root of 21771514 is about 279.2305148187.

The spelling of 21771514 in words is "twenty-one million, seven hundred seventy-one thousand, five hundred fourteen".