21026272 has 12 divisors (see below), whose sum is σ = 41395536. Its totient is φ = 10513120.

The previous prime is 21026267. The next prime is 21026287. The reversal of 21026272 is 27262012.

It is a super-2 number, since 2×21026272² = 884208228435968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328504 + ... + 328567.

It is an arithmetic number, because the mean of its divisors is an integer number (3449628).

Almost surely, 2^21026272 is an apocalyptic number.

It is an amenable number.

21026272 is a deficient number, since it is larger than the sum of its proper divisors (20369264).

21026272 is an equidigital number, since it uses as much as digits as its factorization.

21026272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657081 (or 657073 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21026272 is about 4585.4413091872. The cubic root of 21026272 is about 276.0074212105.

Adding to 21026272 its reverse (27262012), we get a palindrome (48288284).

The spelling of 21026272 in words is "twenty-one million, twenty-six thousand, two hundred seventy-two".