1322221820 has 24 divisors (see below), whose sum is σ = 2778998544. Its totient is φ = 528444416.

The previous prime is 1322221819. The next prime is 1322221847. The reversal of 1322221820 is 281222231.

It is a super-2 number, since 2×1322221820² = 3496541082568224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2822 + ... + 51501.

It is an arithmetic number, because the mean of its divisors is an integer number (115791606).

Almost surely, 2^1322221820 is an apocalyptic number.

1322221820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1322221820 is an abundant number, since it is smaller than the sum of its proper divisors (1456776724).

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

1322221820 is a wasteful number, since it uses less digits than its factorization.

1322221820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55549 (or 55547 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1322221820 is about 36362.3681847044. The cubic root of 1322221820 is about 1097.5764328094.

The spelling of 1322221820 in words is "one billion, three hundred twenty-two million, two hundred twenty-one thousand, eight hundred twenty".