1021985055 has 96 divisors (see below), whose sum is σ = 2202310656. Its totient is φ = 426892032.

The previous prime is 1021985051. The next prime is 1021985071. The reversal of 1021985055 is 5505891201.

It is a happy number.

It is not a de Polignac number, because 1021985055 - 2² = 1021985051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021985051) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 420574 + ... + 422996.

It is an arithmetic number, because the mean of its divisors is an integer number (22940736).

Almost surely, 2^1021985055 is an apocalyptic number.

1021985055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1021985055 is an abundant number, since it is smaller than the sum of its proper divisors (1180325601).

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

1021985055 is a wasteful number, since it uses less digits than its factorization.

1021985055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557 (or 2554 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 1021985055 is about 31968.5009814348. The cubic root of 1021985055 is about 1007.2752934123.

The spelling of 1021985055 in words is "one billion, twenty-one million, nine hundred eighty-five thousand, fifty-five".