1221022309 has 8 divisors (see below), whose sum is σ = 1332961112. Its totient is φ = 1111656960.

The previous prime is 1221022301. The next prime is 1221022339. The reversal of 1221022309 is 9032201221.

It can be written as a sum of positive squares in 4 ways, for example, as 151536100 + 1069486209 = 12310^2 + 32703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221022309 - 2³ = 1221022301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221022309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221022301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642372 + ... + 644269.

It is an arithmetic number, because the mean of its divisors is an integer number (166620139).

Almost surely, 2^1221022309 is an apocalyptic number.

It is an amenable number.

1221022309 is a deficient number, since it is larger than the sum of its proper divisors (111938803).

1221022309 is a wasteful number, since it uses less digits than its factorization.

1221022309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286727.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1221022309 is about 34943.1296394585. The cubic root of 1221022309 is about 1068.8281079036.

The spelling of 1221022309 in words is "one billion, two hundred twenty-one million, twenty-two thousand, three hundred nine".