1020021911 has 2 divisors, whose sum is σ = 1020021912. Its totient is φ = 1020021910.

The previous prime is 1020021887. The next prime is 1020021953. The reversal of 1020021911 is 1191200201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020021911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020021911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020021971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010955 + 510010956.

It is an arithmetic number, because the mean of its divisors is an integer number (510010956).

Almost surely, 2^1020021911 is an apocalyptic number.

1020021911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020021911 is an equidigital number, since it uses as much as digits as its factorization.

1020021911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1020021911 is about 31937.7818735115. The cubic root of 1020021911 is about 1006.6299173876.

The spelling of 1020021911 in words is "one billion, twenty million, twenty-one thousand, nine hundred eleven".