21140959905 has 112 divisors (see below), whose sum is σ = 41579818560. Its totient is φ = 10250976384.

The previous prime is 21140959897. The next prime is 21140959921. The reversal of 21140959905 is 50995904112.

21140959905 is a `hidden beast` number, since 2 + 11 + 40 + 9 + 599 + 0 + 5 = 666.

It is not a de Polignac number, because 21140959905 - 2³ = 21140959897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 3171466 + ... + 3178124.

It is an arithmetic number, because the mean of its divisors is an integer number (371248380).

Almost surely, 2^21140959905 is an apocalyptic number.

It is an amenable number.

21140959905 is a deficient number, since it is larger than the sum of its proper divisors (20438858655).

21140959905 is an equidigital number, since it uses as much as digits as its factorization.

21140959905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762 (or 6747 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The spelling of 21140959905 in words is "twenty-one billion, one hundred forty million, nine hundred fifty-nine thousand, nine hundred five".