1021551040 has 28 divisors (see below), whose sum is σ = 2432569176. Its totient is φ = 408620288.

The previous prime is 1021551023. The next prime is 1021551103. The reversal of 1021551040 is 401551201.

It is a junction number, because it is equal to n+sod(n) for n = 1021550999 and 1021551017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595854 + ... + 1596493.

Almost surely, 2^1021551040 is an apocalyptic number.

1021551040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021551040 is an abundant number, since it is smaller than the sum of its proper divisors (1411018136).

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

1021551040 is an equidigital number, since it uses as much as digits as its factorization.

1021551040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3192364 (or 3192354 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1021551040 is about 31961.7120943168. The cubic root of 1021551040 is about 1007.1326838621.

The spelling of 1021551040 in words is "one billion, twenty-one million, five hundred fifty-one thousand, forty".