2021651750075 has 6 divisors (see below), whose sum is σ = 2506848170124. Its totient is φ = 1617321400040.

The previous prime is 2021651750033. The next prime is 2021651750087. The reversal of 2021651750075 is 5700571561202.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2021651750075 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40433034977 + ... + 40433035026.

It is an arithmetic number, because the mean of its divisors is an integer number (417808028354).

Almost surely, 2^{2021651750075} is an apocalyptic number.

2021651750075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2021651750075 is a deficient number, since it is larger than the sum of its proper divisors (485196420049).

2021651750075 is an equidigital number, since it uses as much as digits as its factorization.

2021651750075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80866070013 (or 80866070008 counting only the distinct ones).

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 2021651750075 in words is "two trillion, twenty-one billion, six hundred fifty-one million, seven hundred fifty thousand, seventy-five".