21980050 has 12 divisors (see below), whose sum is σ = 40882986. Its totient is φ = 8792000.

The previous prime is 21980041. The next prime is 21980051. The reversal of 21980050 is 5008912.

It can be written as a sum of positive squares in 3 ways, for example, as 15421329 + 6558721 = 3927^2 + 2561^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a junction number, because it is equal to n+sod(n) for n = 21979997 and 21980024.

It is not an unprimeable number, because it can be changed into a prime (21980051) 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 5 ways as a sum of consecutive naturals, for example, 219751 + ... + 219850.

Almost surely, 2^21980050 is an apocalyptic number.

21980050 is a deficient number, since it is larger than the sum of its proper divisors (18902936).

21980050 is a wasteful number, since it uses less digits than its factorization.

21980050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439613 (or 439608 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 21980050 is about 4688.2886003317. The cubic root of 21980050 is about 280.1192094437.

Adding to 21980050 its reverse (5008912), we get a palindrome (26988962).

It can be divided in two parts, 2 and 1980050, that multiplied together give a square (3960100 = 1990²).

The spelling of 21980050 in words is "twenty-one million, nine hundred eighty thousand, fifty".