21644671102 has 16 divisors (see below), whose sum is σ = 32521227552. Its totient is φ = 10804278240.

The previous prime is 21644671063. The next prime is 21644671121. The reversal of 21644671102 is 20117644612.

It is a super-2 number, since 2×21644671102² (a number of 21 digits) contains 22 as substring.

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, 4364008 + ... + 4368964.

It is an arithmetic number, because the mean of its divisors is an integer number (2032576722).

Almost surely, 2^21644671102 is an apocalyptic number.

21644671102 is a deficient number, since it is larger than the sum of its proper divisors (10876556450).

21644671102 is a wasteful number, since it uses less digits than its factorization.

21644671102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8163.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 21644671102 in words is "twenty-one billion, six hundred forty-four million, six hundred seventy-one thousand, one hundred two".