109212681825 has 72 divisors (see below), whose sum is σ = 210729512448. Its totient is φ = 53748282240.

The previous prime is 109212681803. The next prime is 109212681841. The reversal of 109212681825 is 528186212901.

It is a de Polignac number, because none of the positive numbers 2^k-109212681825 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 71 ways as a sum of consecutive naturals, for example, 14583232 + ... + 14590718.

It is an arithmetic number, because the mean of its divisors is an integer number (2926798784).

Almost surely, 2^109212681825 is an apocalyptic number.

109212681825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109212681825 is a deficient number, since it is larger than the sum of its proper divisors (101516830623).

109212681825 is a wasteful number, since it uses less digits than its factorization.

109212681825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12503 (or 12495 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 109212681825 in words is "one hundred nine billion, two hundred twelve million, six hundred eighty-one thousand, eight hundred twenty-five".