21947220050 has 162 divisors, whose sum is σ = 49348965069. Its totient is φ = 7240665600.

The previous prime is 21947220047. The next prime is 21947220089. The reversal of 21947220050 is 5002274912.

It can be written as a sum of positive squares in 14 ways, for example, as 7787886001 + 14159334049 = 88249^2 + 118993^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104755.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21947219989 and 21947220016.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 300646814 + ... + 300646886.

Almost surely, 2^21947220050 is an apocalyptic number.

21947220050 is an abundant number, since it is smaller than the sum of its proper divisors (27401745019).

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

21947220050 is an equidigital number, since it uses as much as digits as its factorization.

21947220050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

Multiplying 21947220050 by its sum of digits (32), we get a square (702311041600 = 838040²).

Adding to 21947220050 its reverse (5002274912), we get a palindrome (26949494962).

The spelling of 21947220050 in words is "twenty-one billion, nine hundred forty-seven million, two hundred twenty thousand, fifty".