21770126 has 36 divisors (see below), whose sum is σ = 39571272. Its totient is φ = 8798832.

The previous prime is 21770093. The next prime is 21770129. The reversal of 21770126 is 62107712.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 21770095 and 21770104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770129) 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 17 ways as a sum of consecutive naturals, for example, 506261 + ... + 506303.

It is an arithmetic number, because the mean of its divisors is an integer number (1099202).

Almost surely, 2^21770126 is an apocalyptic number.

21770126 is a deficient number, since it is larger than the sum of its proper divisors (17801146).

21770126 is an equidigital number, since it uses as much as digits as its factorization.

21770126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21770126 is about 4665.8467613071. The cubic root of 21770126 is about 279.2245807621.

Adding to 21770126 its reverse (62107712), we get a palindrome (83877838).

The spelling of 21770126 in words is "twenty-one million, seven hundred seventy thousand, one hundred twenty-six".