61121705255421 has 8 divisors (see below), whose sum is σ = 81851483021280. Its totient is φ = 40569865496592.

The previous prime is 61121705255389. The next prime is 61121705255497. The reversal of 61121705255421 is 12455250712116.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61121705255421 - 2⁵ = 61121705255389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121703255421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44484500955 + ... + 44484502328.

It is an arithmetic number, because the mean of its divisors is an integer number (10231435377660).

Almost surely, 2^{61121705255421} is an apocalyptic number.

It is an amenable number.

61121705255421 is a deficient number, since it is larger than the sum of its proper divisors (20729777765859).

61121705255421 is a wasteful number, since it uses less digits than its factorization.

61121705255421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88969003515.

The product of its (nonzero) digits is 168000, while the sum is 42.

Adding to 61121705255421 its reverse (12455250712116), we get a palindrome (73576955967537).

The spelling of 61121705255421 in words is "sixty-one trillion, one hundred twenty-one billion, seven hundred five million, two hundred fifty-five thousand, four hundred twenty-one".