121561051770 has 96 divisors (see below), whose sum is σ = 319625648784. Its totient is φ = 32051328000.

The previous prime is 121561051709. The next prime is 121561051793. The reversal of 121561051770 is 77150165121.

It is a happy number.

121561051770 is a `hidden beast` number, since 1 + 2 + 15 + 61 + 0 + 517 + 70 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 55557789849 + 66003261921 = 235707^2 + 256911^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6908704 + ... + 6926276.

Almost surely, 2^121561051770 is an apocalyptic number.

121561051770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121561051770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159812824392).

121561051770 is an abundant number, since it is smaller than the sum of its proper divisors (198064597014).

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

121561051770 is a wasteful number, since it uses less digits than its factorization.

121561051770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18448 (or 18445 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 36.

The spelling of 121561051770 in words is "one hundred twenty-one billion, five hundred sixty-one million, fifty-one thousand, seven hundred seventy".