121005343399 has 16 divisors (see below), whose sum is σ = 125392359456. Its totient is φ = 116689766400.

The previous prime is 121005343387. The next prime is 121005343423. The reversal of 121005343399 is 993343500121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121005343399 - 2²⁵ = 120971788967 is a prime.

It is a super-2 number, since 2×121005343399² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121005343369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3206589 + ... + 3244105.

It is an arithmetic number, because the mean of its divisors is an integer number (7837022466).

Almost surely, 2^121005343399 is an apocalyptic number.

121005343399 is a deficient number, since it is larger than the sum of its proper divisors (4387016057).

121005343399 is an equidigital number, since it uses as much as digits as its factorization.

121005343399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38466.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 121005343399 in words is "one hundred twenty-one billion, five million, three hundred forty-three thousand, three hundred ninety-nine".