21120346 has 16 divisors (see below), whose sum is σ = 34532064. Its totient is φ = 9629424.

The previous prime is 21120317. The next prime is 21120349. The reversal of 21120346 is 64302112.

It is not an unprimeable number, because it can be changed into a prime (21120349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2736 + ... + 7051.

It is an arithmetic number, because the mean of its divisors is an integer number (2158254).

Almost surely, 2^21120346 is an apocalyptic number.

21120346 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21120346 is a deficient number, since it is larger than the sum of its proper divisors (13411718).

21120346 is a wasteful number, since it uses less digits than its factorization.

21120346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9885.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21120346 is about 4595.6877613693. The cubic root of 21120346 is about 276.4184386660.

Adding to 21120346 its reverse (64302112), we get a palindrome (85422458).

The spelling of 21120346 in words is "twenty-one million, one hundred twenty thousand, three hundred forty-six".