121422515421 has 16 divisors (see below), whose sum is σ = 166155395904. Its totient is φ = 78841286784.

The previous prime is 121422515407. The next prime is 121422515449. The reversal of 121422515421 is 124515224121.

It is not a de Polignac number, because 121422515421 - 2¹⁰ = 121422514397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121422515491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2765311 + ... + 2808876.

It is an arithmetic number, because the mean of its divisors is an integer number (10384712244).

Almost surely, 2^121422515421 is an apocalyptic number.

It is an amenable number.

121422515421 is a deficient number, since it is larger than the sum of its proper divisors (44732880483).

121422515421 is a wasteful number, since it uses less digits than its factorization.

121422515421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574380.

The product of its digits is 6400, while the sum is 30.

Adding to 121422515421 its reverse (124515224121), we get a palindrome (245937739542).

The spelling of 121422515421 in words is "one hundred twenty-one billion, four hundred twenty-two million, five hundred fifteen thousand, four hundred twenty-one".