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11000021 = 47234043

11000021 has 4 divisors (see below), whose sum is σ = 11234112. Its totient is φ = 10765932.

The previous prime is 10999997. The next prime is 11000027. The reversal of 11000021 is 12000011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12000011 = 17705883.

It is a cyclic number.

It is not a de Polignac number, because 11000021 - 210 = 10998997 is a prime.

It is a Duffinian number.

11000021 is a modest number, since divided by 21 gives 11 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10999969 and 11000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000027) 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, 116975 + ... + 117068.

It is an arithmetic number, because the mean of its divisors is an integer number (2808528).

Almost surely, 211000021 is an apocalyptic number.

It is an amenable number.

11000021 is a deficient number, since it is larger than the sum of its proper divisors (234091).

11000021 is an equidigital number, since it uses as much as digits as its factorization.

11000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234090.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 11000021 is about 3316.6279562230. The cubic root of 11000021 is about 222.3981505828.

Adding to 11000021 its reverse (12000011), we get a palindrome (23000032).

Multiplying 11000021 by its reverse (12000011), we get a palindrome (132000373000231).

The spelling of 11000021 in words is "eleven million, twenty-one", and thus it is an aban number and an uban number.

Divisors: 1 47 234043 11000021