21403161871 has 16 divisors (see below), whose sum is σ = 26372150784. Its totient is φ = 16915214304.

The previous prime is 21403161869. The next prime is 21403161877. The reversal of 21403161871 is 17816130412.

It is a cyclic number.

It is not a de Polignac number, because 21403161871 - 2¹ = 21403161869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403161877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51865 + ... + 213298.

It is an arithmetic number, because the mean of its divisors is an integer number (1648259424).

Almost surely, 2^21403161871 is an apocalyptic number.

21403161871 is a deficient number, since it is larger than the sum of its proper divisors (4968988913).

21403161871 is a wasteful number, since it uses less digits than its factorization.

21403161871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266070.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21403161871 in words is "twenty-one billion, four hundred three million, one hundred sixty-one thousand, eight hundred seventy-one".