21403214 has 16 divisors (see below), whose sum is σ = 36907488. Its totient is φ = 9118752.

The previous prime is 21403211. The next prime is 21403229. The reversal of 21403214 is 41230412.

It is a junction number, because it is equal to n+sod(n) for n = 21403192 and 21403201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1997 + ... + 6840.

It is an arithmetic number, because the mean of its divisors is an integer number (2306718).

Almost surely, 2^21403214 is an apocalyptic number.

21403214 is a deficient number, since it is larger than the sum of its proper divisors (15504274).

21403214 is a wasteful number, since it uses less digits than its factorization.

21403214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9019.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21403214 is about 4626.3607727889. The cubic root of 21403214 is about 277.6470081123.

Adding to 21403214 its reverse (41230412), we get a palindrome (62633626).

The spelling of 21403214 in words is "twenty-one million, four hundred three thousand, two hundred fourteen".