221810147147805 has 32 divisors (see below), whose sum is σ = 357713097412608. Its totient is φ = 117359907840000.

The previous prime is 221810147147791. The next prime is 221810147147873. The reversal of 221810147147805 is 508741741018122.

It is not a de Polignac number, because 221810147147805 - 2²¹ = 221810145050653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26843515 + ... + 34120295.

It is an arithmetic number, because the mean of its divisors is an integer number (11178534294144).

Almost surely, 2^{221810147147805} is an apocalyptic number.

It is an amenable number.

221810147147805 is a deficient number, since it is larger than the sum of its proper divisors (135902950264803).

221810147147805 is a wasteful number, since it uses less digits than its factorization.

221810147147805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7292917.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 221810147147805 in words is "two hundred twenty-one trillion, eight hundred ten billion, one hundred forty-seven million, one hundred forty-seven thousand, eight hundred five".