21004170061 has 8 divisors (see below), whose sum is σ = 24333598784. Its totient is φ = 17756949600.

The previous prime is 21004170059. The next prime is 21004170067. The reversal of 21004170061 is 16007140012.

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

It is a cyclic number.

It is not a de Polignac number, because 21004170061 - 2¹ = 21004170059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004170067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20551515 + ... + 20552536.

It is an arithmetic number, because the mean of its divisors is an integer number (3041699848).

Almost surely, 2^21004170061 is an apocalyptic number.

It is an amenable number.

21004170061 is a deficient number, since it is larger than the sum of its proper divisors (3329428723).

21004170061 is an equidigital number, since it uses as much as digits as its factorization.

21004170061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41104131.

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 21004170061 in words is "twenty-one billion, four million, one hundred seventy thousand, sixty-one".