121425765444 has 117 divisors (see below), whose sum is σ = 320081664847. Its totient is φ = 40305902616.

The previous prime is 121425765397. The next prime is 121425765449. The reversal of 121425765444 is 444567524121.

The square root of 121425765444 is 348462.

It is a perfect power (a square), and thus also a powerful number.

121425765444 is a `hidden beast` number, since 1 + 2 + 14 + 25 + 76 + 544 + 4 = 666.

It is a super-2 number, since 2×121425765444² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121425765444.

It is not an unprimeable number, because it can be changed into a prime (121425765449) by changing a digit.

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 38 ways as a sum of consecutive naturals, for example, 508057477 + ... + 508057715.

Almost surely, 2^121425765444 is an apocalyptic number.

121425765444 is the 348462-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121425765444

121425765444 is an abundant number, since it is smaller than the sum of its proper divisors (198655899403).

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

121425765444 is an frugal number, since it uses more digits than its factorization.

121425765444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 244 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 45.

The spelling of 121425765444 in words is "one hundred twenty-one billion, four hundred twenty-five million, seven hundred sixty-five thousand, four hundred forty-four".