21211130 has 32 divisors (see below), whose sum is σ = 40186368. Its totient is φ = 8049600.

The previous prime is 21211109. The next prime is 21211139. The reversal of 21211130 is 3111212.

It is not an unprimeable number, because it can be changed into a prime (21211139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15785 + ... + 17075.

It is an arithmetic number, because the mean of its divisors is an integer number (1255824).

Almost surely, 2^21211130 is an apocalyptic number.

21211130 is a deficient number, since it is larger than the sum of its proper divisors (18975238).

21211130 is a wasteful number, since it uses less digits than its factorization.

21211130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

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

The square root of 21211130 is about 4605.5542554616. The cubic root of 21211130 is about 276.8139262180.

Adding to 21211130 its reverse (3111212), we get a palindrome (24322342).

The spelling of 21211130 in words is "twenty-one million, two hundred eleven thousand, one hundred thirty".