21475879050 has 96 divisors (see below), whose sum is σ = 54671500800. Its totient is φ = 5576973760.

The previous prime is 21475879049. The next prime is 21475879067. The reversal of 21475879050 is 5097857412.

It is a super-2 number, since 2×21475879050² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 935611 + ... + 958289.

It is an arithmetic number, because the mean of its divisors is an integer number (569494800).

Almost surely, 2^21475879050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21475879050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27335750400).

21475879050 is an abundant number, since it is smaller than the sum of its proper divisors (33195621750).

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

21475879050 is a wasteful number, since it uses less digits than its factorization.

21475879050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22860 (or 22855 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 21475879050 in words is "twenty-one billion, four hundred seventy-five million, eight hundred seventy-nine thousand, fifty".