1021222109 has 4 divisors (see below), whose sum is σ = 1021339200. Its totient is φ = 1021105020.

The previous prime is 1021222087. The next prime is 1021222133. The reversal of 1021222109 is 9012221201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021222109 - 2¹⁶ = 1021156573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44309 + ... + 63290.

It is an arithmetic number, because the mean of its divisors is an integer number (255334800).

Almost surely, 2^1021222109 is an apocalyptic number.

It is an amenable number.

1021222109 is a deficient number, since it is larger than the sum of its proper divisors (117091).

1021222109 is an equidigital number, since it uses as much as digits as its factorization.

1021222109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117090.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1021222109 is about 31956.5659763373. The cubic root of 1021222109 is about 1007.0245761218.

The spelling of 1021222109 in words is "one billion, twenty-one million, two hundred twenty-two thousand, one hundred nine".