121561223067 has 32 divisors (see below), whose sum is σ = 185349830400. Its totient is φ = 78707310336.

The previous prime is 121561223029. The next prime is 121561223083. The reversal of 121561223067 is 760322165121.

121561223067 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 612 + 2 + 30 + 6 + 7 = 666.

It is not a de Polignac number, because 121561223067 - 2¹⁵ = 121561190299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121561223467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327478 + ... + 591915.

It is an arithmetic number, because the mean of its divisors is an integer number (5792182200).

Almost surely, 2^121561223067 is an apocalyptic number.

121561223067 is a deficient number, since it is larger than the sum of its proper divisors (63788607333).

121561223067 is an equidigital number, since it uses as much as digits as its factorization.

121561223067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919544 (or 919538 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

Adding to 121561223067 its reverse (760322165121), we get a palindrome (881883388188).

The spelling of 121561223067 in words is "one hundred twenty-one billion, five hundred sixty-one million, two hundred twenty-three thousand, sixty-seven".