21111230 has 32 divisors (see below), whose sum is σ = 43683840. Its totient is φ = 7195680.

The previous prime is 21111199. The next prime is 21111239. The reversal of 21111230 is 3211112.

It is a super-2 number, since 2×21111230² = 891368064225800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111239) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 12581 + ... + 14159.

It is an arithmetic number, because the mean of its divisors is an integer number (1365120).

Almost surely, 2^21111230 is an apocalyptic number.

21111230 is an abundant number, since it is smaller than the sum of its proper divisors (22572610).

21111230 is a wasteful number, since it uses less digits than its factorization.

21111230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784.

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

The square root of 21111230 is about 4594.6958550050. The cubic root of 21111230 is about 276.3786635425.

Adding to 21111230 its reverse (3211112), we get a palindrome (24322342).

The spelling of 21111230 in words is "twenty-one million, one hundred eleven thousand, two hundred thirty".