21015000555106 has 16 divisors (see below), whose sum is σ = 32269625033184. Its totient is φ = 10258671646944.

The previous prime is 21015000555071. The next prime is 21015000555151. The reversal of 21015000555106 is 60155500051012.

It is a super-2 number, since 2×21015000555106² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52993680 + ... + 53388763.

It is an arithmetic number, because the mean of its divisors is an integer number (2016851564574).

Almost surely, 2^{21015000555106} is an apocalyptic number.

21015000555106 is a deficient number, since it is larger than the sum of its proper divisors (11254624478078).

21015000555106 is a wasteful number, since it uses less digits than its factorization.

21015000555106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106384785.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 21015000555106 in words is "twenty-one trillion, fifteen billion, five hundred fifty-five thousand, one hundred six".