1021135556 has 24 divisors (see below), whose sum is σ = 2046844800. Its totient is φ = 436649472.

The previous prime is 1021135541. The next prime is 1021135571. The reversal of 1021135556 is 6555311201.

It is an interprime number because it is at equal distance from previous prime (1021135541) and next prime (1021135571).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28040 + ... + 53183.

It is an arithmetic number, because the mean of its divisors is an integer number (85285200).

Almost surely, 2^1021135556 is an apocalyptic number.

It is an amenable number.

1021135556 is an abundant number, since it is smaller than the sum of its proper divisors (1025709244).

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

1021135556 is a wasteful number, since it uses less digits than its factorization.

1021135556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81683 (or 81681 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1021135556 is about 31955.2117189043. The cubic root of 1021135556 is about 1006.9961254189.

Adding to 1021135556 its reverse (6555311201), we get a palindrome (7576446757).

The spelling of 1021135556 in words is "one billion, twenty-one million, one hundred thirty-five thousand, five hundred fifty-six".