21141656 has 8 divisors (see below), whose sum is σ = 39640620. Its totient is φ = 10570824.

The previous prime is 21141641. The next prime is 21141707. The reversal of 21141656 is 65614112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321346 + ... + 1321361.

Almost surely, 2^21141656 is an apocalyptic number.

It is an amenable number.

21141656 is a deficient number, since it is larger than the sum of its proper divisors (18498964).

21141656 is a wasteful number, since it uses less digits than its factorization.

21141656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642713 (or 2642709 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 21141656 is about 4598.0056546290. The cubic root of 21141656 is about 276.5113742791.

Adding to 21141656 its reverse (65614112), we get a palindrome (86755768).

The spelling of 21141656 in words is "twenty-one million, one hundred forty-one thousand, six hundred fifty-six".