1021139064 has 96 divisors (see below), whose sum is σ = 3028849200. Its totient is φ = 308221440.

The previous prime is 1021139057. The next prime is 1021139081. The reversal of 1021139064 is 4609311201.

1021139064 is a `hidden beast` number, since 1 + 0 + 211 + 390 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210652 + ... + 215444.

Almost surely, 2^1021139064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021139064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514424600).

1021139064 is an abundant number, since it is smaller than the sum of its proper divisors (2007710136).

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

1021139064 is a wasteful number, since it uses less digits than its factorization.

1021139064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5085 (or 5078 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1021139064 is about 31955.2666081821. The cubic root of 1021139064 is about 1006.9972785594.

The spelling of 1021139064 in words is "one billion, twenty-one million, one hundred thirty-nine thousand, sixty-four".