1630171225221 has 64 divisors (see below), whose sum is σ = 2870943989760. Its totient is φ = 796571458560.

The previous prime is 1630171225213. The next prime is 1630171225223. The reversal of 1630171225221 is 1225221710361.

It is a happy number.

It is not a de Polignac number, because 1630171225221 - 2³ = 1630171225213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630171225223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6789595 + ... + 7025591.

It is an arithmetic number, because the mean of its divisors is an integer number (44858499840).

Almost surely, 2^{1630171225221} is an apocalyptic number.

1630171225221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1630171225221 is a deficient number, since it is larger than the sum of its proper divisors (1240772764539).

1630171225221 is a wasteful number, since it uses less digits than its factorization.

1630171225221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237794.

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 1630171225221 its reverse (1225221710361), we get a palindrome (2855392935582).

The spelling of 1630171225221 in words is "one trillion, six hundred thirty billion, one hundred seventy-one million, two hundred twenty-five thousand, two hundred twenty-one".