47205021 has 4 divisors (see below), whose sum is σ = 62940032. Its totient is φ = 31470012.

The previous prime is 47204923. The next prime is 47205023. The reversal of 47205021 is 12050274.

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 not a de Polignac number, because 47205021 - 2¹³ = 47196829 is a prime.

It is a super-2 number, since 2×47205021² = 4456628015220882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47205023) 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, 7867501 + ... + 7867506.

It is an arithmetic number, because the mean of its divisors is an integer number (15735008).

Almost surely, 2^47205021 is an apocalyptic number.

It is an amenable number.

47205021 is a deficient number, since it is larger than the sum of its proper divisors (15735011).

47205021 is a wasteful number, since it uses less digits than its factorization.

47205021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15735010.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 47205021 is about 6870.5910226122. The cubic root of 47205021 is about 361.4065880860.

Adding to 47205021 its reverse (12050274), we get a palindrome (59255295).

The spelling of 47205021 in words is "forty-seven million, two hundred five thousand, twenty-one".