21141056 has 14 divisors (see below), whose sum is σ = 41951910. Its totient is φ = 10570496.

The previous prime is 21141041. The next prime is 21141061. The reversal of 21141056 is 65014112.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 8065600 = 3616^2 + 2840^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165101 + ... + 165228.

It is an arithmetic number, because the mean of its divisors is an integer number (2996565).

Almost surely, 2^21141056 is an apocalyptic number.

It is an amenable number.

21141056 is a deficient number, since it is larger than the sum of its proper divisors (20810854).

21141056 is an equidigital number, since it uses as much as digits as its factorization.

21141056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330341 (or 330331 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21141056 is about 4597.9404084873. The cubic root of 21141056 is about 276.5087584576.

Adding to 21141056 its reverse (65014112), we get a palindrome (86155168).

The spelling of 21141056 in words is "twenty-one million, one hundred forty-one thousand, fifty-six".