21714210 has 64 divisors (see below), whose sum is σ = 66182400. Its totient is φ = 4962816.

The previous prime is 21714197. The next prime is 21714223. The reversal of 21714210 is 1241712.

It is an interprime number because it is at equal distance from previous prime (21714197) and next prime (21714223).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3855 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (1034100).

Almost surely, 2^21714210 is an apocalyptic number.

21714210 is an abundant number, since it is smaller than the sum of its proper divisors (44468190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21714210 is a wasteful number, since it uses less digits than its factorization.

21714210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11512 (or 11506 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21714210 is about 4659.8508559824. The cubic root of 21714210 is about 278.9853154487.

Adding to 21714210 its reverse (1241712), we get a palindrome (22955922).

The spelling of 21714210 in words is "twenty-one million, seven hundred fourteen thousand, two hundred ten".