21606876074 has 16 divisors (see below), whose sum is σ = 37116428928. Its totient is φ = 9241072272.

The previous prime is 21606876073. The next prime is 21606876077. The reversal of 21606876074 is 47067860612.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21606876073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577729 + ... + 1591364.

It is an arithmetic number, because the mean of its divisors is an integer number (2319776808).

Almost surely, 2^21606876074 is an apocalyptic number.

21606876074 is a deficient number, since it is larger than the sum of its proper divisors (15509552854).

21606876074 is a wasteful number, since it uses less digits than its factorization.

21606876074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169589.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 21606876074 in words is "twenty-one billion, six hundred six million, eight hundred seventy-six thousand, seventy-four".