1211101025 has 24 divisors (see below), whose sum is σ = 1571518464. Its totient is φ = 924739200.

The previous prime is 1211101019. The next prime is 1211101027. The reversal of 1211101025 is 5201011121.

It is a de Polignac number, because none of the positive numbers 2^k-1211101025 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211101027) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 45872 + ... + 67278.

It is an arithmetic number, because the mean of its divisors is an integer number (65479936).

Almost surely, 2^1211101025 is an apocalyptic number.

It is an amenable number.

1211101025 is a deficient number, since it is larger than the sum of its proper divisors (360417439).

1211101025 is a wasteful number, since it uses less digits than its factorization.

1211101025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21521 (or 21516 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1211101025 is about 34800.8767849317. The cubic root of 1211101025 is about 1065.9253494442.

Adding to 1211101025 its reverse (5201011121), we get a palindrome (6412112146).

The spelling of 1211101025 in words is "one billion, two hundred eleven million, one hundred one thousand, twenty-five".