21227011 has 8 divisors (see below), whose sum is σ = 23478224. Its totient is φ = 19064160.

The previous prime is 21226969. The next prime is 21227023. The reversal of 21227011 is 11072212.

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

It is a cyclic number.

It is not a de Polignac number, because 21227011 - 2⁷ = 21226883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21227081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21585 + ... + 22546.

It is an arithmetic number, because the mean of its divisors is an integer number (2934778).

Almost surely, 2^21227011 is an apocalyptic number.

21227011 is a deficient number, since it is larger than the sum of its proper divisors (2251213).

21227011 is a wasteful number, since it uses less digits than its factorization.

21227011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44181.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21227011 is about 4607.2780467430. The cubic root of 21227011 is about 276.8829935000.

Adding to 21227011 its reverse (11072212), we get a palindrome (32299223).

The spelling of 21227011 in words is "twenty-one million, two hundred twenty-seven thousand, eleven".