21000146471 has 4 divisors (see below), whose sum is σ = 21078214200. Its totient is φ = 20922078744.

The previous prime is 21000146467. The next prime is 21000146477. The reversal of 21000146471 is 17464100012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000146471 - 2² = 21000146467 is a prime.

It is a super-3 number, since 3×21000146471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000146471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000146477) 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 3 ways as a sum of consecutive naturals, for example, 39033461 + ... + 39033998.

It is an arithmetic number, because the mean of its divisors is an integer number (5269553550).

Almost surely, 2^21000146471 is an apocalyptic number.

21000146471 is a deficient number, since it is larger than the sum of its proper divisors (78067729).

21000146471 is an equidigital number, since it uses as much as digits as its factorization.

21000146471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78067728.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21000146471 its reverse (17464100012), we get a palindrome (38464246483).

The spelling of 21000146471 in words is "twenty-one billion, one hundred forty-six thousand, four hundred seventy-one".