47155021 has 4 divisors (see below), whose sum is σ = 47752000. Its totient is φ = 46558044.

The previous prime is 47155019. The next prime is 47155027. The reversal of 47155021 is 12055174.

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 47155021 - 2¹ = 47155019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47155027) 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, 298371 + ... + 298528.

It is an arithmetic number, because the mean of its divisors is an integer number (11938000).

Almost surely, 2^47155021 is an apocalyptic number.

It is an amenable number.

47155021 is a deficient number, since it is larger than the sum of its proper divisors (596979).

47155021 is an equidigital number, since it uses as much as digits as its factorization.

47155021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596978.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 47155021 is about 6866.9513614121. The cubic root of 47155021 is about 361.2789412604.

The spelling of 47155021 in words is "forty-seven million, one hundred fifty-five thousand, twenty-one".