21112405677 has 32 divisors (see below), whose sum is σ = 34148352000. Its totient is φ = 12785163120.

The previous prime is 21112405669. The next prime is 21112405747. The reversal of 21112405677 is 77650421112.

It is not a de Polignac number, because 21112405677 - 2³ = 21112405669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112405627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 352074 + ... + 407652.

It is an arithmetic number, because the mean of its divisors is an integer number (1067136000).

Almost surely, 2^21112405677 is an apocalyptic number.

21112405677 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21112405677 is a deficient number, since it is larger than the sum of its proper divisors (13035946323).

21112405677 is a wasteful number, since it uses less digits than its factorization.

21112405677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56878 (or 56872 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

Adding to 21112405677 its reverse (77650421112), we get a palindrome (98762826789).

The spelling of 21112405677 in words is "twenty-one billion, one hundred twelve million, four hundred five thousand, six hundred seventy-seven".