1021221469 has 2 divisors, whose sum is σ = 1021221470. Its totient is φ = 1021221468.

The previous prime is 1021221379. The next prime is 1021221473. The reversal of 1021221469 is 9641221201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706868569 + 314352900 = 26587^2 + 17730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021221469 - 2²³ = 1012832861 is a prime.

It is a super-2 number, since 2×1021221469² = 2085786577493035922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021221269) by changing a digit.

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 as a sum of consecutive naturals, namely, 510610734 + 510610735.

It is an arithmetic number, because the mean of its divisors is an integer number (510610735).

Almost surely, 2^1021221469 is an apocalyptic number.

It is an amenable number.

1021221469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221469 is an equidigital number, since it uses as much as digits as its factorization.

1021221469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1021221469 is about 31956.5559627442. Note that the first 3 decimals coincide. The cubic root of 1021221469 is about 1007.0243657543.

The spelling of 1021221469 in words is "one billion, twenty-one million, two hundred twenty-one thousand, four hundred sixty-nine".