1021219985 has 8 divisors (see below), whose sum is σ = 1236309480. Its totient is φ = 809745664.

The previous prime is 1021219957. The next prime is 1021220021. The reversal of 1021219985 is 5899121201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 56310016 + 964909969 = 7504^2 + 31063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021219985 - 2⁶ = 1021219921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 903170 + ... + 904299.

It is an arithmetic number, because the mean of its divisors is an integer number (154538685).

Almost surely, 2^1021219985 is an apocalyptic number.

It is an amenable number.

1021219985 is a deficient number, since it is larger than the sum of its proper divisors (215089495).

1021219985 is a wasteful number, since it uses less digits than its factorization.

1021219985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807587.

The product of its (nonzero) digits is 12960, while the sum is 38.

The square root of 1021219985 is about 31956.5327437130. The cubic root of 1021219985 is about 1007.0238779643.

The spelling of 1021219985 in words is "one billion, twenty-one million, two hundred nineteen thousand, nine hundred eighty-five".