947670021 has 6 divisors (see below), whose sum is σ = 1368856710. Its totient is φ = 631780008.

The previous prime is 947670019. The next prime is 947670079. The reversal of 947670021 is 120076749.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 923552100 + 24117921 = 30390^2 + 4911^2 .

It is not a de Polignac number, because 947670021 - 2¹ = 947670019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947670121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52648326 + ... + 52648343.

It is an arithmetic number, because the mean of its divisors is an integer number (228142785).

Almost surely, 2^947670021 is an apocalyptic number.

It is an amenable number.

947670021 is a deficient number, since it is larger than the sum of its proper divisors (421186689).

947670021 is a wasteful number, since it uses less digits than its factorization.

947670021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105296675 (or 105296672 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 947670021 is about 30784.2495604489. The cubic root of 947670021 is about 982.2432372962.

It can be divided in two parts, 9476 and 70021, that added together give a palindrome (79497).

The spelling of 947670021 in words is "nine hundred forty-seven million, six hundred seventy thousand, twenty-one".