1720211017125 has 32 divisors (see below), whose sum is σ = 2928999325824. Its totient is φ = 896109916800.

The previous prime is 1720211017121. The next prime is 1720211017141. The reversal of 1720211017125 is 5217101120271.

It is not a de Polignac number, because 1720211017125 - 2² = 1720211017121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720211017092 and 1720211017101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720211017121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53323752 + ... + 53356001.

It is an arithmetic number, because the mean of its divisors is an integer number (91531228932).

Almost surely, 2^{1720211017125} is an apocalyptic number.

1720211017125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1720211017125 is a deficient number, since it is larger than the sum of its proper divisors (1208788308699).

1720211017125 is a wasteful number, since it uses less digits than its factorization.

1720211017125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106679814 (or 106679804 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 30.

Adding to 1720211017125 its reverse (5217101120271), we get a palindrome (6937312137396).

The spelling of 1720211017125 in words is "one trillion, seven hundred twenty billion, two hundred eleven million, seventeen thousand, one hundred twenty-five".