21772126 has 8 divisors (see below), whose sum is σ = 32893560. Its totient is φ = 10807608.

The previous prime is 21772123. The next prime is 21772141. The reversal of 21772126 is 62127712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21772094 and 21772103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21772123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38881 + ... + 39436.

It is an arithmetic number, because the mean of its divisors is an integer number (4111695).

Almost surely, 2^21772126 is an apocalyptic number.

21772126 is a deficient number, since it is larger than the sum of its proper divisors (11121434).

21772126 is a wasteful number, since it uses less digits than its factorization.

21772126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78458.

The product of its digits is 2352, while the sum is 28.

The square root of 21772126 is about 4666.0610797545. The cubic root of 21772126 is about 279.2331311959.

Adding to 21772126 its reverse (62127712), we get a palindrome (83899838).

The spelling of 21772126 in words is "twenty-one million, seven hundred seventy-two thousand, one hundred twenty-six".