2010001219921 has 2 divisors, whose sum is σ = 2010001219922. Its totient is φ = 2010001219920.

The previous prime is 2010001219903. The next prime is 2010001220021. The reversal of 2010001219921 is 1299121000102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1914656131521 + 95345088400 = 1383711^2 + 308780^2 .

It is a cyclic number.

It is not a de Polignac number, because 2010001219921 - 2³³ = 2001411285329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2010001219921.

It is not a weakly prime, because it can be changed into another prime (2010001219621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005000609960 + 1005000609961.

It is an arithmetic number, because the mean of its divisors is an integer number (1005000609961).

Almost surely, 2^{2010001219921} is an apocalyptic number.

It is an amenable number.

2010001219921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2010001219921 is an equidigital number, since it uses as much as digits as its factorization.

2010001219921 is an evil number, because the sum of its binary digits is even.

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

The spelling of 2010001219921 in words is "two trillion, ten billion, one million, two hundred nineteen thousand, nine hundred twenty-one".