121425255440 has 20 divisors (see below), whose sum is σ = 282313719084. Its totient is φ = 48570102144.

The previous prime is 121425255439. The next prime is 121425255451. The reversal of 121425255440 is 44552524121.

It can be written as a sum of positive squares in 2 ways, for example, as 40243569664 + 81181685776 = 200608^2 + 284924^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 121425255440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758907767 + ... + 758907926.

Almost surely, 2^121425255440 is an apocalyptic number.

121425255440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121425255440 is an abundant number, since it is smaller than the sum of its proper divisors (160888463644).

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

121425255440 is a wasteful number, since it uses less digits than its factorization.

121425255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517815706 (or 1517815700 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 121425255440 its reverse (44552524121), we get a palindrome (165977779561).

The spelling of 121425255440 in words is "one hundred twenty-one billion, four hundred twenty-five million, two hundred fifty-five thousand, four hundred forty".