47000021 has 4 divisors (see below), whose sum is σ = 47073312. Its totient is φ = 46926732.

The previous prime is 47000011. The next prime is 47000059. The reversal of 47000021 is 12000074.

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.

It is a cyclic number.

It is not a de Polignac number, because 47000021 - 2⁶ = 46999957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47000011) 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, 35675 + ... + 36968.

It is an arithmetic number, because the mean of its divisors is an integer number (11768328).

Almost surely, 2^47000021 is an apocalyptic number.

It is an amenable number.

47000021 is a deficient number, since it is larger than the sum of its proper divisors (73291).

47000021 is an equidigital number, since it uses as much as digits as its factorization.

47000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73290.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 47000021 is about 6855.6561319833. The cubic root of 47000021 is about 360.8826617623.

Adding to 47000021 its reverse (12000074), we get a palindrome (59000095).

The spelling of 47000021 in words is "forty-seven million, twenty-one", and thus it is an aban number and an uban number.