21066721102 has 32 divisors (see below), whose sum is σ = 36224727552. Its totient is φ = 9001057824.

The previous prime is 21066721099. The next prime is 21066721127. The reversal of 21066721102 is 20112766012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7868188 + ... + 7870864.

It is an arithmetic number, because the mean of its divisors is an integer number (1132022736).

Almost surely, 2^21066721102 is an apocalyptic number.

21066721102 is a deficient number, since it is larger than the sum of its proper divisors (15158006450).

21066721102 is a wasteful number, since it uses less digits than its factorization.

21066721102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 21066721102 in words is "twenty-one billion, sixty-six million, seven hundred twenty-one thousand, one hundred two".