1021554016 has 144 divisors (see below), whose sum is σ = 2478307104. Its totient is φ = 405706752.

The previous prime is 1021553989. The next prime is 1021554031. The reversal of 1021554016 is 6104551201.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4384236 + ... + 4384468.

It is an arithmetic number, because the mean of its divisors is an integer number (17210466).

Almost surely, 2^1021554016 is an apocalyptic number.

1021554016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021554016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239153552).

1021554016 is an abundant number, since it is smaller than the sum of its proper divisors (1456753088).

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

1021554016 is a wasteful number, since it uses less digits than its factorization.

1021554016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1021554016 is about 31961.7586499867. The cubic root of 1021554016 is about 1007.1336618599.

The spelling of 1021554016 in words is "one billion, twenty-one million, five hundred fifty-four thousand, sixteen".