1019121020 has 12 divisors (see below), whose sum is σ = 2140154184. Its totient is φ = 407648400.

The previous prime is 1019121017. The next prime is 1019121067. The reversal of 1019121020 is 201219101.

It is a self number, because there is not a number n which added to its sum of digits gives 1019121020.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25478006 + ... + 25478045.

It is an arithmetic number, because the mean of its divisors is an integer number (178346182).

Almost surely, 2^1019121020 is an apocalyptic number.

1019121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019121020 is an abundant number, since it is smaller than the sum of its proper divisors (1121033164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1019121020 is a wasteful number, since it uses less digits than its factorization.

1019121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50956060 (or 50956058 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1019121020 is about 31923.6749137689. The cubic root of 1019121020 is about 1006.3334757337. Note that the first 3 decimals are identical.

The spelling of 1019121020 in words is "one billion, nineteen million, one hundred twenty-one thousand, twenty".