47020921 has 2 divisors, whose sum is σ = 47020922. Its totient is φ = 47020920.

The previous prime is 47020907. The next prime is 47020937. The reversal of 47020921 is 12902074.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 20611600 = 5139^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 47020921 - 2¹⁷ = 46889849 is a prime.

It is not a weakly prime, because it can be changed into another prime (47020951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23510460 + 23510461.

It is an arithmetic number, because the mean of its divisors is an integer number (23510461).

Almost surely, 2^47020921 is an apocalyptic number.

It is an amenable number.

47020921 is a deficient number, since it is larger than the sum of its proper divisors (1).

47020921 is an equidigital number, since it uses as much as digits as its factorization.

47020921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 47020921 is about 6857.1802513861. The cubic root of 47020921 is about 360.9361463478.

Adding to 47020921 its reverse (12902074), we get a palindrome (59922995).

The spelling of 47020921 in words is "forty-seven million, twenty thousand, nine hundred twenty-one".