1221012354 has 8 divisors (see below), whose sum is σ = 2442024720. Its totient is φ = 407004116.

The previous prime is 1221012337. The next prime is 1221012361. The reversal of 1221012354 is 4532101221.

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

1221012354 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221012354.

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, 101751024 + ... + 101751035.

It is an arithmetic number, because the mean of its divisors is an integer number (305253090).

Almost surely, 2^1221012354 is an apocalyptic number.

1221012354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221012354 is a wasteful number, since it uses less digits than its factorization.

1221012354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203502064.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221012354 is about 34942.9871934270. The cubic root of 1221012354 is about 1068.8252031757.

Adding to 1221012354 its reverse (4532101221), we get a palindrome (5753113575).

The spelling of 1221012354 in words is "one billion, two hundred twenty-one million, twelve thousand, three hundred fifty-four".