121213424 has 20 divisors (see below), whose sum is σ = 235625544. Its totient is φ = 60406848.

The previous prime is 121213409. The next prime is 121213429. The reversal of 121213424 is 424312121.

It is a junction number, because it is equal to n+sod(n) for n = 121213396 and 121213405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213429) 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, 7427 + ... + 17250.

Almost surely, 2^121213424 is an apocalyptic number.

It is an amenable number.

121213424 is a deficient number, since it is larger than the sum of its proper divisors (114412120).

121213424 is a wasteful number, since it uses less digits than its factorization.

121213424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24992 (or 24986 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 121213424 is about 11009.6968168974. The cubic root of 121213424 is about 494.8993762067.

Adding to 121213424 its reverse (424312121), we get a palindrome (545525545).

The spelling of 121213424 in words is "one hundred twenty-one million, two hundred thirteen thousand, four hundred twenty-four".