21502010404423 has 8 divisors (see below), whose sum is σ = 22070883596256. Its totient is φ = 20940117252000.

The previous prime is 21502010404397. The next prime is 21502010404549. The reversal of 21502010404423 is 32440401020512.

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 21502010404423 - 2²¹ = 21502008307271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21502010404391 and 21502010404400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21502010404723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1745003611 + ... + 1745015932.

It is an arithmetic number, because the mean of its divisors is an integer number (2758860449532).

Almost surely, 2^{21502010404423} is an apocalyptic number.

21502010404423 is a deficient number, since it is larger than the sum of its proper divisors (568873191833).

21502010404423 is a wasteful number, since it uses less digits than its factorization.

21502010404423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490019705.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21502010404423 its reverse (32440401020512), we get a palindrome (53942411424935).

The spelling of 21502010404423 in words is "twenty-one trillion, five hundred two billion, ten million, four hundred four thousand, four hundred twenty-three".