21112641902 has 16 divisors (see below), whose sum is σ = 35199809712. Its totient is φ = 9415585920.

The previous prime is 21112641889. The next prime is 21112641923. The reversal of 21112641902 is 20914621112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9052283 + ... + 9054614.

It is an arithmetic number, because the mean of its divisors is an integer number (2199988107).

Almost surely, 2^21112641902 is an apocalyptic number.

21112641902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21112641902 is a deficient number, since it is larger than the sum of its proper divisors (14087167810).

21112641902 is a wasteful number, since it uses less digits than its factorization.

21112641902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18106963.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 21112641902 in words is "twenty-one billion, one hundred twelve million, six hundred forty-one thousand, nine hundred two".