21072177835 has 16 divisors (see below), whose sum is σ = 26390525760. Its totient is φ = 16122050560.

The previous prime is 21072177793. The next prime is 21072177851. The reversal of 21072177835 is 53877127012.

It is not a de Polignac number, because 21072177835 - 2¹⁵ = 21072145067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21072177791 and 21072177800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890031 + ... + 913399.

It is an arithmetic number, because the mean of its divisors is an integer number (1649407860).

Almost surely, 2^21072177835 is an apocalyptic number.

21072177835 is a deficient number, since it is larger than the sum of its proper divisors (5318347925).

21072177835 is a wasteful number, since it uses less digits than its factorization.

21072177835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31238.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 21072177835 in words is "twenty-one billion, seventy-two million, one hundred seventy-seven thousand, eight hundred thirty-five".