21112405699 has 16 divisors (see below), whose sum is σ = 26593330176. Its totient is φ = 16281619200.

The previous prime is 21112405669. The next prime is 21112405747. The reversal of 21112405699 is 99650421112.

It is not a de Polignac number, because 21112405699 - 2⁹ = 21112405187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112405669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405867 + ... + 1420804.

It is an arithmetic number, because the mean of its divisors is an integer number (1662083136).

Almost surely, 2^21112405699 is an apocalyptic number.

21112405699 is a deficient number, since it is larger than the sum of its proper divisors (5480924477).

21112405699 is a wasteful number, since it uses less digits than its factorization.

21112405699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826786.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21112405699 in words is "twenty-one billion, one hundred twelve million, four hundred five thousand, six hundred ninety-nine".