21211310 has 8 divisors (see below), whose sum is σ = 38180376. Its totient is φ = 8484520.

The previous prime is 21211259. The next prime is 21211319. The reversal of 21211310 is 1311212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21211310² = 899839343832200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211291 and 21211300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060556 + ... + 1060575.

It is an arithmetic number, because the mean of its divisors is an integer number (4772547).

Almost surely, 2^21211310 is an apocalyptic number.

21211310 is a deficient number, since it is larger than the sum of its proper divisors (16969066).

21211310 is a wasteful number, since it uses less digits than its factorization.

21211310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121138.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21211310 is about 4605.5737970420. The cubic root of 21211310 is about 276.8147092404.

Adding to 21211310 its reverse (1311212), we get a palindrome (22522522).

The spelling of 21211310 in words is "twenty-one million, two hundred eleven thousand, three hundred ten".