21123214 has 48 divisors (see below), whose sum is σ = 40383360. Its totient is φ = 8225280.

The previous prime is 21123211. The next prime is 21123287. The reversal of 21123214 is 41232112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51442 + ... + 51850.

It is an arithmetic number, because the mean of its divisors is an integer number (841320).

Almost surely, 2^21123214 is an apocalyptic number.

21123214 is a deficient number, since it is larger than the sum of its proper divisors (19260146).

21123214 is a wasteful number, since it uses less digits than its factorization.

21123214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 466 counting only the distinct ones).

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

The square root of 21123214 is about 4595.9997824195. Note that the first 3 decimals coincide. The cubic root of 21123214 is about 276.4309500172.

Adding to 21123214 its reverse (41232112), we get a palindrome (62355326).

The spelling of 21123214 in words is "twenty-one million, one hundred twenty-three thousand, two hundred fourteen".