21662073258 has 64 divisors (see below), whose sum is σ = 49929004800. Its totient is φ = 6137344512.

The previous prime is 21662073229. The next prime is 21662073259. The reversal of 21662073258 is 85237026612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21662073259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4234110 + ... + 4239222.

It is an arithmetic number, because the mean of its divisors is an integer number (780140700).

Almost surely, 2^21662073258 is an apocalyptic number.

21662073258 is an abundant number, since it is smaller than the sum of its proper divisors (28266931542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21662073258 is a wasteful number, since it uses less digits than its factorization.

21662073258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 21662073258 in words is "twenty-one billion, six hundred sixty-two million, seventy-three thousand, two hundred fifty-eight".