21270011 has 8 divisors (see below), whose sum is σ = 24470784. Its totient is φ = 18109800.

The previous prime is 21269981. The next prime is 21270017. The reversal of 21270011 is 11007212.

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 21270011 - 2⁶ = 21269947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21270017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9005 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (3058848).

Almost surely, 2^21270011 is an apocalyptic number.

21270011 is a deficient number, since it is larger than the sum of its proper divisors (3200773).

21270011 is a wasteful number, since it uses less digits than its factorization.

21270011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20281.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 21270011 is about 4611.9422155964. The cubic root of 21270011 is about 277.0698299536.

Adding to 21270011 its reverse (11007212), we get a palindrome (32277223).

The spelling of 21270011 in words is "twenty-one million, two hundred seventy thousand, eleven".