121281622109 has 4 divisors (see below), whose sum is σ = 121399258080. Its totient is φ = 121163986140.

The previous prime is 121281622081. The next prime is 121281622117. The reversal of 121281622109 is 901226182121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121281622109 is a prime.

It is a super-2 number, since 2×121281622109² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121281622199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58816439 + ... + 58818500.

It is an arithmetic number, because the mean of its divisors is an integer number (30349814520).

Almost surely, 2^121281622109 is an apocalyptic number.

It is an amenable number.

121281622109 is a deficient number, since it is larger than the sum of its proper divisors (117635971).

121281622109 is a wasteful number, since it uses less digits than its factorization.

121281622109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117635970.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 121281622109 in words is "one hundred twenty-one billion, two hundred eighty-one million, six hundred twenty-two thousand, one hundred nine".