20536176921 has 16 divisors (see below), whose sum is σ = 29650770240. Its totient is φ = 12567821760.

The previous prime is 20536176893. The next prime is 20536176967. The reversal of 20536176921 is 12967163502.

It is not a de Polignac number, because 20536176921 - 2¹³ = 20536168729 is a prime.

It is a super-2 number, since 2×20536176921² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20536176121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1447551 + ... + 1461668.

It is an arithmetic number, because the mean of its divisors is an integer number (1853173140).

Almost surely, 2^20536176921 is an apocalyptic number.

It is an amenable number.

20536176921 is a deficient number, since it is larger than the sum of its proper divisors (9114593319).

20536176921 is a wasteful number, since it uses less digits than its factorization.

20536176921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909416.

The product of its (nonzero) digits is 136080, while the sum is 42.

It can be divided in two parts, 205361 and 76921, that added together give a palindrome (282282).

The spelling of 20536176921 in words is "twenty billion, five hundred thirty-six million, one hundred seventy-six thousand, nine hundred twenty-one".