1021440855 has 32 divisors (see below), whose sum is σ = 1775831040. Its totient is φ = 499443840.

The previous prime is 1021440841. The next prime is 1021440881. The reversal of 1021440855 is 5580441201.

It is not a de Polignac number, because 1021440855 - 2⁴ = 1021440839 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 48972 + ... + 66641.

It is an arithmetic number, because the mean of its divisors is an integer number (55494720).

Almost surely, 2^1021440855 is an apocalyptic number.

1021440855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1021440855 is a deficient number, since it is larger than the sum of its proper divisors (754390185).

1021440855 is a wasteful number, since it uses less digits than its factorization.

1021440855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115671.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 1021440855 is about 31959.9883448039. The cubic root of 1021440855 is about 1007.0964726171.

The spelling of 1021440855 in words is "one billion, twenty-one million, four hundred forty thousand, eight hundred fifty-five".