21082011 has 8 divisors (see below), whose sum is σ = 28132944. Its totient is φ = 14042880.

The previous prime is 21082003. The next prime is 21082013. The reversal of 21082011 is 11028012.

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

It is not a de Polignac number, because 21082011 - 2³ = 21082003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21082013) 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, 2851 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (3516618).

Almost surely, 2^21082011 is an apocalyptic number.

21082011 is a deficient number, since it is larger than the sum of its proper divisors (7050933).

21082011 is a wasteful number, since it uses less digits than its factorization.

21082011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5901.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 21082011 is about 4591.5151094165. The cubic root of 21082011 is about 276.2510973660.

The spelling of 21082011 in words is "twenty-one million, eighty-two thousand, eleven".