121225511 has 4 divisors (see below), whose sum is σ = 132246024. Its totient is φ = 110205000.

The previous prime is 121225477. The next prime is 121225523. The reversal of 121225511 is 115522121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121225511 - 2¹⁰ = 121224487 is a prime.

It is a super-2 number, since 2×121225511² = 29391249034422242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121225411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510240 + ... + 5510261.

It is an arithmetic number, because the mean of its divisors is an integer number (33061506).

Almost surely, 2^121225511 is an apocalyptic number.

121225511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121225511 is a deficient number, since it is larger than the sum of its proper divisors (11020513).

121225511 is a wasteful number, since it uses less digits than its factorization.

121225511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020512.

The product of its digits is 200, while the sum is 20.

The square root of 121225511 is about 11010.2457284113. The cubic root of 121225511 is about 494.9158255673.

Adding to 121225511 its reverse (115522121), we get a palindrome (236747632).

The spelling of 121225511 in words is "one hundred twenty-one million, two hundred twenty-five thousand, five hundred eleven".