21010214 has 4 divisors (see below), whose sum is σ = 31515324. Its totient is φ = 10505106.

The previous prime is 21010193. The next prime is 21010217. The reversal of 21010214 is 41201012.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21010195 and 21010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252552 + ... + 5252555.

It is an arithmetic number, because the mean of its divisors is an integer number (7878831).

Almost surely, 2^21010214 is an apocalyptic number.

21010214 is a deficient number, since it is larger than the sum of its proper divisors (10505110).

21010214 is a wasteful number, since it uses less digits than its factorization.

21010214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505109.

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

The square root of 21010214 is about 4583.6899982438. The cubic root of 21010214 is about 275.9371399938.

Adding to 21010214 its reverse (41201012), we get a palindrome (62211226).

The spelling of 21010214 in words is "twenty-one million, ten thousand, two hundred fourteen".