1010021985 has 48 divisors (see below), whose sum is σ = 2030710656.
Its totient is φ = 454823424.
The previous prime is 1010021981. The next prime is 1010021989. The reversal of 1010021985 is 5891200101.
It is an interprime number because it is at equal distance from previous prime (1010021981) and next prime (1010021989).
It is not a de Polignac number, because 1010021985 - 22 = 1010021981 is a prime.
It is not an unprimeable number, because it can be changed into a prime (1010021981) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2824 + ... + 45033.
It is an arithmetic number, because the mean of its divisors is an integer number (42306472).
Almost surely, 21010021985 is an apocalyptic number.
1010021985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
1010021985 is an abundant number, since it is smaller than the sum of its proper divisors (1020688671).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1010021985 is a wasteful number, since it uses less digits than its factorization.
1010021985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 47942 (or 47939 counting only the distinct ones).
The product of its (nonzero) digits is 720, while the sum is 27.
The square root of 1010021985 is about 31780.8430504919.
The cubic root of 1010021985 is about 1003.3295633706.
The spelling of 1010021985 in words is "one billion, ten million, twenty-one thousand, nine hundred eighty-five".