21272626 has 8 divisors (see below), whose sum is σ = 31947804. Its totient is φ = 10623360.

The previous prime is 21272621. The next prime is 21272681. The reversal of 21272626 is 62627212.

It can be written as a sum of positive squares in 2 ways, for example, as 16410601 + 4862025 = 4051^2 + 2205^2 .

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 = 21272594 and 21272603.

It is not an unprimeable number, because it can be changed into a prime (21272621) 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, 4275 + ... + 7798.

Almost surely, 2^21272626 is an apocalyptic number.

21272626 is a deficient number, since it is larger than the sum of its proper divisors (10675178).

21272626 is a wasteful number, since it uses less digits than its factorization.

21272626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12956.

The product of its digits is 4032, while the sum is 28.

The square root of 21272626 is about 4612.2257100016. The cubic root of 21272626 is about 277.0811840915.

Adding to 21272626 its reverse (62627212), we get a palindrome (83899838).

It can be divided in two parts, 2127 and 2626, that added together give a triangular number (4753 = T₉₇).

The spelling of 21272626 in words is "twenty-one million, two hundred seventy-two thousand, six hundred twenty-six".