21478076 has 12 divisors (see below), whose sum is σ = 38040072. Its totient is φ = 10609488.

The previous prime is 21478073. The next prime is 21478081. The reversal of 21478076 is 67087412.

It is a happy number.

It is a super-2 number, since 2×21478076² = 922615497323552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32015 + ... + 32678.

It is an arithmetic number, because the mean of its divisors is an integer number (3170006).

Almost surely, 2^21478076 is an apocalyptic number.

It is an amenable number.

21478076 is a deficient number, since it is larger than the sum of its proper divisors (16561996).

21478076 is a wasteful number, since it uses less digits than its factorization.

21478076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64780 (or 64778 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 21478076 is about 4634.4445190335. Note that the first 3 decimals coincide. The cubic root of 21478076 is about 277.9703399856.

The spelling of 21478076 in words is "twenty-one million, four hundred seventy-eight thousand, seventy-six".