21161067623 has 8 divisors (see below), whose sum is σ = 21892392480. Its totient is φ = 20429851680.

The previous prime is 21161067569. The next prime is 21161067659. The reversal of 21161067623 is 32676016112.

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 21161067623 - 2¹⁴ = 21161051239 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 (21161067523) 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 7 ways as a sum of consecutive naturals, for example, 678161 + ... + 708677.

It is an arithmetic number, because the mean of its divisors is an integer number (2736549060).

Almost surely, 2^21161067623 is an apocalyptic number.

21161067623 is a deficient number, since it is larger than the sum of its proper divisors (731324857).

21161067623 is a wasteful number, since it uses less digits than its factorization.

21161067623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54457.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 21161067623 in words is "twenty-one billion, one hundred sixty-one million, sixty-seven thousand, six hundred twenty-three".