21063015105 has 64 divisors (see below), whose sum is σ = 37140719616. Its totient is φ = 10192459200.

The previous prime is 21063015097. The next prime is 21063015107. The reversal of 21063015105 is 50151036012.

It is not a de Polignac number, because 21063015105 - 2³ = 21063015097 is a prime.

It is a super-2 number, since 2×21063015105² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21063015107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19305610 + ... + 19306700.

It is an arithmetic number, because the mean of its divisors is an integer number (580323744).

Almost surely, 2^21063015105 is an apocalyptic number.

It is an amenable number.

21063015105 is a deficient number, since it is larger than the sum of its proper divisors (16077704511).

21063015105 is a wasteful number, since it uses less digits than its factorization.

21063015105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2077 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21063015105 in words is "twenty-one billion, sixty-three million, fifteen thousand, one hundred five".