122121421 has 8 divisors (see below), whose sum is σ = 134927424. Its totient is φ = 109940160.

The previous prime is 122121413. The next prime is 122121437. The reversal of 122121421 is 124121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122121421 - 2³ = 122121413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122121395 and 122121404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122131421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155775 + ... + 156556.

It is an arithmetic number, because the mean of its divisors is an integer number (16865928).

Almost surely, 2^122121421 is an apocalyptic number.

It is an amenable number.

122121421 is a deficient number, since it is larger than the sum of its proper divisors (12806003).

122121421 is a wasteful number, since it uses less digits than its factorization.

122121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312371.

The product of its digits is 64, while the sum is 16.

The square root of 122121421 is about 11050.8561206813. The cubic root of 122121421 is about 496.1320497464.

Adding to 122121421 its reverse (124121221), we get a palindrome (246242642).

The spelling of 122121421 in words is "one hundred twenty-two million, one hundred twenty-one thousand, four hundred twenty-one".