121216641 has 48 divisors (see below), whose sum is σ = 204390144. Its totient is φ = 63334656.

The previous prime is 121216639. The next prime is 121216649. The reversal of 121216641 is 146612121.

It is a happy number.

It is not a de Polignac number, because 121216641 - 2¹ = 121216639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121216649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 261576 + ... + 262038.

It is an arithmetic number, because the mean of its divisors is an integer number (4258128).

Almost surely, 2^121216641 is an apocalyptic number.

It is an amenable number.

121216641 is a deficient number, since it is larger than the sum of its proper divisors (83173503).

121216641 is a wasteful number, since it uses less digits than its factorization.

121216641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 623 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 121216641 is about 11009.8429144107. The cubic root of 121216641 is about 494.9037543720.

Adding to 121216641 its reverse (146612121), we get a palindrome (267828762).

The spelling of 121216641 in words is "one hundred twenty-one million, two hundred sixteen thousand, six hundred forty-one".