211121025 has 24 divisors (see below), whose sum is σ = 364232640. Its totient is φ = 107701440.

The previous prime is 211121021. The next prime is 211121047. The reversal of 211121025 is 520121112.

It is not a de Polignac number, because 211121025 - 2² = 211121021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 211120995 and 211121013.

It is not an unprimeable number, because it can be changed into a prime (211121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59470 + ... + 62919.

It is an arithmetic number, because the mean of its divisors is an integer number (15176360).

Almost surely, 2^211121025 is an apocalyptic number.

211121025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211121025 is a deficient number, since it is larger than the sum of its proper divisors (153111615).

211121025 is a wasteful number, since it uses less digits than its factorization.

211121025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122425 (or 122420 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 211121025 is about 14530.0043014446. The cubic root of 211121025 is about 595.4479831278.

Adding to 211121025 its reverse (520121112), we get a palindrome (731242137).

The spelling of 211121025 in words is "two hundred eleven million, one hundred twenty-one thousand, twenty-five".