21020471174 has 8 divisors (see below), whose sum is σ = 31584423528. Its totient is φ = 10492330000.

The previous prime is 21020471159. The next prime is 21020471201. The reversal of 21020471174 is 47117402012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8951327 + ... + 8953674.

It is an arithmetic number, because the mean of its divisors is an integer number (3948052941).

Almost surely, 2^21020471174 is an apocalyptic number.

21020471174 is a deficient number, since it is larger than the sum of its proper divisors (10563952354).

21020471174 is a wasteful number, since it uses less digits than its factorization.

21020471174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17905590.

The product of its (nonzero) digits is 3136, while the sum is 29.

Adding to 21020471174 its reverse (47117402012), we get a palindrome (68137873186).

The spelling of 21020471174 in words is "twenty-one billion, twenty million, four hundred seventy-one thousand, one hundred seventy-four".