121312144421 has 16 divisors (see below), whose sum is σ = 130835449584. Its totient is φ = 111816367104.

The previous prime is 121312144417. The next prime is 121312144453. The reversal of 121312144421 is 124441213121.

It can be written as a sum of positive squares in 8 ways, for example, as 46403191396 + 74908953025 = 215414^2 + 273695^2 .

It is not a de Polignac number, because 121312144421 - 2² = 121312144417 is a prime.

It is a super-2 number, since 2×121312144421² (a number of 23 digits) 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 (121312144621) 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, 41873645 + ... + 41876541.

It is an arithmetic number, because the mean of its divisors is an integer number (8177215599).

Almost surely, 2^121312144421 is an apocalyptic number.

It is an amenable number.

121312144421 is a deficient number, since it is larger than the sum of its proper divisors (9523305163).

121312144421 is a wasteful number, since it uses less digits than its factorization.

121312144421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520.

The product of its digits is 1536, while the sum is 26.

Adding to 121312144421 its reverse (124441213121), we get a palindrome (245753357542).

The spelling of 121312144421 in words is "one hundred twenty-one billion, three hundred twelve million, one hundred forty-four thousand, four hundred twenty-one".