21418125850 has 48 divisors (see below), whose sum is σ = 44470055520. Its totient is φ = 7607275200.

The previous prime is 21418125823. The next prime is 21418125851. The reversal of 21418125850 is 5852181412.

It is a super-2 number, since 2×21418125850² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21418125851) 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 23 ways as a sum of consecutive naturals, for example, 429165 + ... + 476464.

It is an arithmetic number, because the mean of its divisors is an integer number (926459490).

Almost surely, 2^21418125850 is an apocalyptic number.

21418125850 is an abundant number, since it is smaller than the sum of its proper divisors (23051929670).

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

21418125850 is a wasteful number, since it uses less digits than its factorization.

21418125850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905695 (or 905690 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 37.

The spelling of 21418125850 in words is "twenty-one billion, four hundred eighteen million, one hundred twenty-five thousand, eight hundred fifty".