1021157632 has 144 divisors (see below), whose sum is σ = 2392068672. Its totient is φ = 429916160.

The previous prime is 1021157623. The next prime is 1021157633. The reversal of 1021157632 is 2367511201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021157632.

It is not an unprimeable number, because it can be changed into a prime (1021157633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3973248 + ... + 3973504.

It is an arithmetic number, because the mean of its divisors is an integer number (16611588).

Almost surely, 2^1021157632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021157632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1196034336).

1021157632 is an abundant number, since it is smaller than the sum of its proper divisors (1370911040).

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

1021157632 is a wasteful number, since it uses less digits than its factorization.

1021157632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1021157632 is about 31955.5571380003. The cubic root of 1021157632 is about 1007.0033821395.

Adding to 1021157632 its reverse (2367511201), we get a palindrome (3388668833).

The spelling of 1021157632 in words is "one billion, twenty-one million, one hundred fifty-seven thousand, six hundred thirty-two".