21201214 has 4 divisors (see below), whose sum is σ = 31801824. Its totient is φ = 10600606.

The previous prime is 21201209. The next prime is 21201251. The reversal of 21201214 is 41210212.

It is a happy number.

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 = 21201194 and 21201203.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5300302 + ... + 5300305.

It is an arithmetic number, because the mean of its divisors is an integer number (7950456).

Almost surely, 2^21201214 is an apocalyptic number.

21201214 is a deficient number, since it is larger than the sum of its proper divisors (10600610).

21201214 is a wasteful number, since it uses less digits than its factorization.

21201214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600609.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21201214 is about 4604.4776033770. The cubic root of 21201214 is about 276.7707835419.

Adding to 21201214 its reverse (41210212), we get a palindrome (62411426).

It can be divided in two parts, 2 and 1201214, that added together give a square (1201216 = 1096²).

The spelling of 21201214 in words is "twenty-one million, two hundred one thousand, two hundred fourteen".