21861167701 has 16 divisors (see below), whose sum is σ = 22714272000. Its totient is φ = 21014884800.

The previous prime is 21861167683. The next prime is 21861167743. The reversal of 21861167701 is 10776116812.

It is not a de Polignac number, because 21861167701 - 2¹¹ = 21861165653 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 (21861167771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9219046 + ... + 9221416.

It is an arithmetic number, because the mean of its divisors is an integer number (1419642000).

Almost surely, 2^21861167701 is an apocalyptic number.

It is an amenable number.

21861167701 is a deficient number, since it is larger than the sum of its proper divisors (853104299).

21861167701 is a wasteful number, since it uses less digits than its factorization.

21861167701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 21861167701 in words is "twenty-one billion, eight hundred sixty-one million, one hundred sixty-seven thousand, seven hundred one".