1621622104225 has 6 divisors (see below), whose sum is σ = 2010811409270. Its totient is φ = 1297297683360.

The previous prime is 1621622104189. The next prime is 1621622104247. The reversal of 1621622104225 is 5224012261261.

It can be written as a sum of positive squares in 3 ways, for example, as 420075089424 + 1201547014801 = 648132^2 + 1096151^2 .

It is not a de Polignac number, because 1621622104225 - 2¹⁹ = 1621621579937 is a prime.

It is a super-2 number, since 2×1621622104225² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32432442060 + ... + 32432442109.

Almost surely, 2^{1621622104225} is an apocalyptic number.

It is an amenable number.

1621622104225 is a deficient number, since it is larger than the sum of its proper divisors (389189305045).

1621622104225 is an equidigital number, since it uses as much as digits as its factorization.

1621622104225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64864884179 (or 64864884174 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 1621622104225 its reverse (5224012261261), we get a palindrome (6845634365486).

The spelling of 1621622104225 in words is "one trillion, six hundred twenty-one billion, six hundred twenty-two million, one hundred four thousand, two hundred twenty-five".