1221322019 has 4 divisors (see below), whose sum is σ = 1222410696. Its totient is φ = 1220233344.

The previous prime is 1221322013. The next prime is 1221322021. The reversal of 1221322019 is 9102231221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9102231221 = 14447 ⋅630043.

It is a cyclic number.

It is not a de Polignac number, because 1221322019 - 2²⁰ = 1220273443 is a prime.

It is a super-2 number, since 2×1221322019² = 2983254948188472722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221321985 and 1221322003.

It is not an unprimeable number, because it can be changed into a prime (1221322013) 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, 542654 + ... + 544899.

It is an arithmetic number, because the mean of its divisors is an integer number (305602674).

Almost surely, 2^1221322019 is an apocalyptic number.

1221322019 is a deficient number, since it is larger than the sum of its proper divisors (1088677).

1221322019 is a wasteful number, since it uses less digits than its factorization.

1221322019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088676.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1221322019 is about 34947.4179160636. The cubic root of 1221322019 is about 1068.9155516420.

The spelling of 1221322019 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, nineteen".