121005201999 has 32 divisors (see below), whose sum is σ = 177343561728. Its totient is φ = 72781628000.

The previous prime is 121005201929. The next prime is 121005202027. The reversal of 121005201999 is 999102500121.

It is a cyclic number.

It is not a de Polignac number, because 121005201999 - 2⁷ = 121005201871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121005201929) 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, 2694322 + ... + 2738864.

It is an arithmetic number, because the mean of its divisors is an integer number (5541986304).

Almost surely, 2^121005201999 is an apocalyptic number.

121005201999 is a deficient number, since it is larger than the sum of its proper divisors (56338359729).

121005201999 is a wasteful number, since it uses less digits than its factorization.

121005201999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45179.

The product of its (nonzero) digits is 14580, while the sum is 39.

The spelling of 121005201999 in words is "one hundred twenty-one billion, five million, two hundred one thousand, nine hundred ninety-nine".