1221554212 has 12 divisors (see below), whose sum is σ = 2137994460. Its totient is φ = 610698656.

The previous prime is 1221554209. The next prime is 1221554221. The reversal of 1221554212 is 2124551221.

It can be written as a sum of positive squares in 2 ways, for example, as 1127347776 + 94206436 = 33576^2 + 9706^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28578 + ... + 57094.

It is an arithmetic number, because the mean of its divisors is an integer number (178166205).

Almost surely, 2^1221554212 is an apocalyptic number.

It is an amenable number.

1221554212 is a deficient number, since it is larger than the sum of its proper divisors (916440248).

1221554212 is a wasteful number, since it uses less digits than its factorization.

1221554212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39230 (or 39228 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 1221554212 is about 34950.7397918842. The cubic root of 1221554212 is about 1068.9832867077.

The spelling of 1221554212 in words is "one billion, two hundred twenty-one million, five hundred fifty-four thousand, two hundred twelve".