21109073067 has 12 divisors (see below), whose sum is σ = 31273819320. Its totient is φ = 14072212080.

The previous prime is 21109073033. The next prime is 21109073087. The reversal of 21109073067 is 76037090112.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 21109073067 - 2⁶ = 21109073003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21109073087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 740967 + ... + 768927.

It is an arithmetic number, because the mean of its divisors is an integer number (2606151610).

Almost surely, 2^21109073067 is an apocalyptic number.

21109073067 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21109073067 is a deficient number, since it is larger than the sum of its proper divisors (10164746253).

21109073067 is an frugal number, since it uses more digits than its factorization.

21109073067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55931 (or 27964 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The spelling of 21109073067 in words is "twenty-one billion, one hundred nine million, seventy-three thousand, sixty-seven".