2051020449890 has 16 divisors (see below), whose sum is σ = 3691916807040. Its totient is φ = 820390402800.

The previous prime is 2051020449857. The next prime is 2051020449899. The reversal of 2051020449890 is 989440201502.

It is not an unprimeable number, because it can be changed into a prime (2051020449899) 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 7 ways as a sum of consecutive naturals, for example, 1732436 + ... + 2665215.

It is an arithmetic number, because the mean of its divisors is an integer number (230744800440).

Almost surely, 2^{2051020449890} is an apocalyptic number.

2051020449890 is a deficient number, since it is larger than the sum of its proper divisors (1640896357150).

2051020449890 is a wasteful number, since it uses less digits than its factorization.

2051020449890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444297.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 2051020449890 in words is "two trillion, fifty-one billion, twenty million, four hundred forty-nine thousand, eight hundred ninety".