121423434440 has 64 divisors (see below), whose sum is σ = 340616396160. Its totient is φ = 37846264320.

The previous prime is 121423434409. The next prime is 121423434469. The reversal of 121423434440 is 44434324121.

It is a super-2 number, since 2×121423434440² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121423434397 and 121423434406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19708517 + ... + 19714676.

It is an arithmetic number, because the mean of its divisors is an integer number (5322131190).

Almost surely, 2^121423434440 is an apocalyptic number.

121423434440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121423434440 is an abundant number, since it is smaller than the sum of its proper divisors (219192961720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121423434440 is a wasteful number, since it uses less digits than its factorization.

121423434440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39423222 (or 39423218 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 121423434440 its reverse (44434324121), we get a palindrome (165857758561).

The spelling of 121423434440 in words is "one hundred twenty-one billion, four hundred twenty-three million, four hundred thirty-four thousand, four hundred forty".