21006214 has 8 divisors (see below), whose sum is σ = 31718448. Its totient is φ = 10433400.

The previous prime is 21006163. The next prime is 21006217. The reversal of 21006214 is 41260012.

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

It is a super-2 number, since 2×21006214² = 882522053227592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34477 + ... + 35080.

It is an arithmetic number, because the mean of its divisors is an integer number (3964806).

Almost surely, 2^21006214 is an apocalyptic number.

21006214 is a deficient number, since it is larger than the sum of its proper divisors (10712234).

21006214 is a wasteful number, since it uses less digits than its factorization.

21006214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69710.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21006214 is about 4583.2536477921. The cubic root of 21006214 is about 275.9196275812.

Adding to 21006214 its reverse (41260012), we get a palindrome (62266226).

The spelling of 21006214 in words is "twenty-one million, six thousand, two hundred fourteen".