1021554040 has 64 divisors (see below), whose sum is σ = 2505232800. Its totient is φ = 372628992.

The previous prime is 1021554031. The next prime is 1021554041. The reversal of 1021554040 is 404551201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021554041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31326 + ... + 54994.

Almost surely, 2^1021554040 is an apocalyptic number.

1021554040 is a gapful number since it is divisible by the number (10) 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 1021554040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252616400).

1021554040 is an abundant number, since it is smaller than the sum of its proper divisors (1483678760).

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

1021554040 is a wasteful number, since it uses less digits than its factorization.

1021554040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23776 (or 23772 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1021554040 is about 31961.7590254354. The cubic root of 1021554040 is about 1007.1336697469.

The spelling of 1021554040 in words is "one billion, twenty-one million, five hundred fifty-four thousand, forty".