11212121025 has 36 divisors (see below), whose sum is σ = 22951036992. Its totient is φ = 5125540320.

The previous prime is 11212121023. The next prime is 11212121059. The reversal of 11212121025 is 52012121211.

It is not a de Polignac number, because 11212121025 - 2¹ = 11212121023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212120989 and 11212121007.

It is not an unprimeable number, because it can be changed into a prime (11212121023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3557829 + ... + 3560978.

Almost surely, 2^11212121025 is an apocalyptic number.

11212121025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11212121025 is an abundant number, since it is smaller than the sum of its proper divisors (11738915967).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11212121025 is a wasteful number, since it uses less digits than its factorization.

11212121025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118830 (or 7118822 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 11212121025 its reverse (52012121211), we get a palindrome (63224242236).

The spelling of 11212121025 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, twenty-five".