20210121199 has 8 divisors (see below), whose sum is σ = 20912916960. Its totient is φ = 19507718496.

The previous prime is 20210121089. The next prime is 20210121209. The reversal of 20210121199 is 99112101202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20210121199 - 2²³ = 20201732591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210121599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8334 + ... + 201220.

It is an arithmetic number, because the mean of its divisors is an integer number (2614114620).

Almost surely, 2^20210121199 is an apocalyptic number.

20210121199 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20210121199 is a deficient number, since it is larger than the sum of its proper divisors (702795761).

20210121199 is a wasteful number, since it uses less digits than its factorization.

20210121199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196529.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 20210121199 in words is "twenty billion, two hundred ten million, one hundred twenty-one thousand, one hundred ninety-nine".