21061214 has 16 divisors (see below), whose sum is σ = 33495936. Its totient is φ = 9914400.

The previous prime is 21061207. The next prime is 21061223. The reversal of 21061214 is 41216012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21061192 and 21061201.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2297 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (2093496).

Almost surely, 2^21061214 is an apocalyptic number.

21061214 is a deficient number, since it is larger than the sum of its proper divisors (12434722).

21061214 is a wasteful number, since it uses less digits than its factorization.

21061214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9251.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21061214 is about 4589.2498297652. The cubic root of 21061214 is about 276.1602286742.

Adding to 21061214 its reverse (41216012), we get a palindrome (62277226).

It can be divided in two parts, 21061 and 214, that multiplied together give a palindrome (4507054).

The spelling of 21061214 in words is "twenty-one million, sixty-one thousand, two hundred fourteen".