21711070 has 8 divisors (see below), whose sum is σ = 39079944. Its totient is φ = 8684424.

The previous prime is 21711043. The next prime is 21711071. The reversal of 21711070 is 7011712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711071) 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 3 ways as a sum of consecutive naturals, for example, 1085544 + ... + 1085563.

It is an arithmetic number, because the mean of its divisors is an integer number (4884993).

Almost surely, 2^21711070 is an apocalyptic number.

21711070 is a deficient number, since it is larger than the sum of its proper divisors (17368874).

21711070 is a wasteful number, since it uses less digits than its factorization.

21711070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171114.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 21711070 is about 4659.5139231469. The cubic root of 21711070 is about 278.9718671719.

Adding to 21711070 its reverse (7011712), we get a palindrome (28722782).

The spelling of 21711070 in words is "twenty-one million, seven hundred eleven thousand, seventy".