1721211255 has 32 divisors (see below), whose sum is σ = 3096817920. Its totient is φ = 906913440.

The previous prime is 1721211241. The next prime is 1721211259. The reversal of 1721211255 is 5521121271.

It is not a de Polignac number, because 1721211255 - 2²⁰ = 1720162679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721211259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65601 + ... + 88010.

It is an arithmetic number, because the mean of its divisors is an integer number (96775560).

Almost surely, 2^1721211255 is an apocalyptic number.

1721211255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1721211255 is a deficient number, since it is larger than the sum of its proper divisors (1375606665).

1721211255 is a wasteful number, since it uses less digits than its factorization.

1721211255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153708 (or 153702 counting only the distinct ones).

The product of its digits is 1400, while the sum is 27.

The square root of 1721211255 is about 41487.4831123798. The cubic root of 1721211255 is about 1198.4264688182.

The spelling of 1721211255 in words is "one billion, seven hundred twenty-one million, two hundred eleven thousand, two hundred fifty-five".