121444440541551 has 12 divisors (see below), whose sum is σ = 181468704257880. Its totient is φ = 78171134141520.

The previous prime is 121444440541471. The next prime is 121444440541561. The reversal of 121444440541551 is 155145044444121.

121444440541551 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 4 + 4 + 4 + 40 + 54 + 1 + 551 = 666.

It is not a de Polignac number, because 121444440541551 - 2⁷ = 121444440541423 is a prime.

It is a super-2 number, since 2×121444440541551² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121444440541497 and 121444440541506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121444440541561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232652184685 + ... + 232652185206.

It is an arithmetic number, because the mean of its divisors is an integer number (15122392021490).

Almost surely, 2^{121444440541551} is an apocalyptic number.

121444440541551 is a deficient number, since it is larger than the sum of its proper divisors (60024263716329).

121444440541551 is a wasteful number, since it uses less digits than its factorization.

121444440541551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465304369926 (or 465304369923 counting only the distinct ones).

The product of its (nonzero) digits is 1024000, while the sum is 45.

Adding to 121444440541551 its reverse (155145044444121), we get a palindrome (276589484985672).

The spelling of 121444440541551 in words is "one hundred twenty-one trillion, four hundred forty-four billion, four hundred forty million, five hundred forty-one thousand, five hundred fifty-one".