21210847378 has 16 divisors (see below), whose sum is σ = 36370592064. Its totient is φ = 9088078320.

The previous prime is 21210847367. The next prime is 21210847409. The reversal of 21210847378 is 87374801212.

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, 132100 + ... + 244687.

It is an arithmetic number, because the mean of its divisors is an integer number (2273162004).

Almost surely, 2^21210847378 is an apocalyptic number.

21210847378 is a deficient number, since it is larger than the sum of its proper divisors (15159744686).

21210847378 is a wasteful number, since it uses less digits than its factorization.

21210847378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380817.

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 21210847378 in words is "twenty-one billion, two hundred ten million, eight hundred forty-seven thousand, three hundred seventy-eight".