21078626 has 16 divisors (see below), whose sum is σ = 33139584. Its totient is φ = 10036224.

The previous prime is 21078601. The next prime is 21078637. The reversal of 21078626 is 62687012.

It is a junction number, because it is equal to n+sod(n) for n = 21078592 and 21078601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10931 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (2071224).

Almost surely, 2^21078626 is an apocalyptic number.

21078626 is a deficient number, since it is larger than the sum of its proper divisors (12060958).

21078626 is a wasteful number, since it uses less digits than its factorization.

21078626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21078626 is about 4591.1464799111. The cubic root of 21078626 is about 276.2363113000.

The spelling of 21078626 in words is "twenty-one million, seventy-eight thousand, six hundred twenty-six".