1899121021201 has 16 divisors (see below), whose sum is σ = 1921399219584. Its totient is φ = 1876919514624.

The previous prime is 1899121021181. The next prime is 1899121021229. The reversal of 1899121021201 is 1021201219981.

It is a cyclic number.

It is not a de Polignac number, because 1899121021201 - 2¹⁵ = 1899120988433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1899121021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178701850 + ... + 178712476.

It is an arithmetic number, because the mean of its divisors is an integer number (120087451224).

Almost surely, 2^{1899121021201} is an apocalyptic number.

It is an amenable number.

1899121021201 is a deficient number, since it is larger than the sum of its proper divisors (22278198383).

1899121021201 is a wasteful number, since it uses less digits than its factorization.

1899121021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 1899121021201 in words is "one trillion, eight hundred ninety-nine billion, one hundred twenty-one million, twenty-one thousand, two hundred one".