21887827658 has 16 divisors (see below), whose sum is σ = 34765770240. Its totient is φ = 10299339456.

The previous prime is 21887827649. The next prime is 21887827697. The reversal of 21887827658 is 85672878812.

It is a self number, because there is not a number n which added to its sum of digits gives 21887827658.

It is an unprimeable number.

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, 779735 + ... + 807317.

It is an arithmetic number, because the mean of its divisors is an integer number (2172860640).

Almost surely, 2^21887827658 is an apocalyptic number.

21887827658 is a deficient number, since it is larger than the sum of its proper divisors (12877942582).

21887827658 is a wasteful number, since it uses less digits than its factorization.

21887827658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50941.

The product of its digits is 24084480, while the sum is 62.

The spelling of 21887827658 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred twenty-seven thousand, six hundred fifty-eight".