1021981630 has 32 divisors (see below), whose sum is σ = 1897395840. Its totient is φ = 396115200.

The previous prime is 1021981627. The next prime is 1021981651. The reversal of 1021981630 is 361891201.

It is a junction number, because it is equal to n+sod(n) for n = 1021981592 and 1021981601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36706 + ... + 58234.

It is an arithmetic number, because the mean of its divisors is an integer number (59293620).

Almost surely, 2^1021981630 is an apocalyptic number.

1021981630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021981630 is a deficient number, since it is larger than the sum of its proper divisors (875414210).

1021981630 is a wasteful number, since it uses less digits than its factorization.

1021981630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21684.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1021981630 is about 31968.4474130352. The cubic root of 1021981630 is about 1007.2741681767.

The spelling of 1021981630 in words is "one billion, twenty-one million, nine hundred eighty-one thousand, six hundred thirty".