1021132440 has 128 divisors (see below), whose sum is σ = 3411000000. Its totient is φ = 271724544.

The previous prime is 1021132423. The next prime is 1021132457. The reversal of 1021132440 is 442311201.

1021132440 is a `hidden beast` number, since 10 + 211 + 3 + 2 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (1021132423) and next prime (1021132457).

It is a super-2 number, since 2×1021132440² = 2085422920040707200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 816936 + ... + 818184.

Almost surely, 2^1021132440 is an apocalyptic number.

1021132440 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 1021132440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705500000).

1021132440 is an abundant number, since it is smaller than the sum of its proper divisors (2389867560).

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

1021132440 is a wasteful number, since it uses less digits than its factorization.

1021132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2026 (or 2016 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1021132440 is about 31955.1629631269. The cubic root of 1021132440 is about 1006.9951011333.

Adding to 1021132440 its reverse (442311201), we get a palindrome (1463443641).

The spelling of 1021132440 in words is "one billion, twenty-one million, one hundred thirty-two thousand, four hundred forty".