1021639933 has 2 divisors, whose sum is σ = 1021639934. Its totient is φ = 1021639932.

The previous prime is 1021639907. The next prime is 1021639961. The reversal of 1021639933 is 3399361201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974813284 + 46826649 = 31222^2 + 6843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021639933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021639892 and 1021639901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021630933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510819966 + 510819967.

It is an arithmetic number, because the mean of its divisors is an integer number (510819967).

Almost surely, 2^1021639933 is an apocalyptic number.

It is an amenable number.

1021639933 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021639933 is an equidigital number, since it uses as much as digits as its factorization.

1021639933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 1021639933 is about 31963.1026810602. The cubic root of 1021639933 is about 1007.1618957975.

The spelling of 1021639933 in words is "one billion, twenty-one million, six hundred thirty-nine thousand, nine hundred thirty-three".