211621031425 has 6 divisors (see below), whose sum is σ = 262410078998. Its totient is φ = 169296825120.

The previous prime is 211621031393. The next prime is 211621031441. The reversal of 211621031425 is 524130126112.

It can be written as a sum of positive squares in 3 ways, for example, as 1871687169 + 209749344256 = 43263^2 + 457984^2 .

It is not a de Polignac number, because 211621031425 - 2⁵ = 211621031393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211621031393 and 211621031402.

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, 4232420604 + ... + 4232420653.

Almost surely, 2^211621031425 is an apocalyptic number.

211621031425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211621031425 is a deficient number, since it is larger than the sum of its proper divisors (50789047573).

211621031425 is an equidigital number, since it uses as much as digits as its factorization.

211621031425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8464841267 (or 8464841262 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 211621031425 its reverse (524130126112), we get a palindrome (735751157537).

The spelling of 211621031425 in words is "two hundred eleven billion, six hundred twenty-one million, thirty-one thousand, four hundred twenty-five".