47821821 has 8 divisors (see below), whose sum is σ = 63876384. Its totient is φ = 31824240.

The previous prime is 47821817. The next prime is 47821849. The reversal of 47821821 is 12812874.

It is a happy number.

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

It is not a de Polignac number, because 47821821 - 2² = 47821817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47821021) 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, 12246 + ... + 15671.

It is an arithmetic number, because the mean of its divisors is an integer number (7984548).

Almost surely, 2^47821821 is an apocalyptic number.

It is an amenable number.

47821821 is a deficient number, since it is larger than the sum of its proper divisors (16054563).

47821821 is a wasteful number, since it uses less digits than its factorization.

47821821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28491.

The product of its digits is 7168, while the sum is 33.

The square root of 47821821 is about 6915.3323130563. The cubic root of 47821821 is about 362.9738766499.

The spelling of 47821821 in words is "forty-seven million, eight hundred twenty-one thousand, eight hundred twenty-one".