21880393623 has 16 divisors (see below), whose sum is σ = 35362252800. Its totient is φ = 13260844440.

The previous prime is 21880393589. The next prime is 21880393637. The reversal of 21880393623 is 32639308812.

21880393623 is a `hidden beast` number, since 2 + 18 + 8 + 0 + 3 + 9 + 3 + 623 = 666.

It is not a de Polignac number, because 21880393623 - 2²¹ = 21878296471 is a prime.

It is a super-2 number, since 2×21880393623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880323623) 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, 36835383 + ... + 36835976.

It is an arithmetic number, because the mean of its divisors is an integer number (2210140800).

Almost surely, 2^21880393623 is an apocalyptic number.

21880393623 is a deficient number, since it is larger than the sum of its proper divisors (13481859177).

21880393623 is a wasteful number, since it uses less digits than its factorization.

21880393623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73671379 (or 73671373 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 21880393623 in words is "twenty-one billion, eight hundred eighty million, three hundred ninety-three thousand, six hundred twenty-three".