21001214 has 16 divisors (see below), whose sum is σ = 34110720. Its totient is φ = 9639840.

The previous prime is 21001187. The next prime is 21001247. The reversal of 21001214 is 41210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001195 and 21001204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852 + ... + 7080.

It is an arithmetic number, because the mean of its divisors is an integer number (2131920).

Almost surely, 2^21001214 is an apocalyptic number.

21001214 is a deficient number, since it is larger than the sum of its proper divisors (13109506).

21001214 is a wasteful number, since it uses less digits than its factorization.

21001214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21001214 is about 4582.7081513009. The cubic root of 21001214 is about 275.8977339388.

Adding to 21001214 its reverse (41210012), we get a palindrome (62211226).

The spelling of 21001214 in words is "twenty-one million, one thousand, two hundred fourteen".