21485876 has 6 divisors (see below), whose sum is σ = 37600290. Its totient is φ = 10742936.

The previous prime is 21485857. The next prime is 21485879. The reversal of 21485876 is 67858412.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 2788900 = 4324^2 + 1670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2685731 + ... + 2685738.

It is an arithmetic number, because the mean of its divisors is an integer number (6266715).

Almost surely, 2^21485876 is an apocalyptic number.

It is an amenable number.

21485876 is a deficient number, since it is larger than the sum of its proper divisors (16114414).

21485876 is a wasteful number, since it uses less digits than its factorization.

21485876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371473 (or 5371471 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 21485876 is about 4635.2859674458. The cubic root of 21485876 is about 278.0039852438.

The spelling of 21485876 in words is "twenty-one million, four hundred eighty-five thousand, eight hundred seventy-six".