1221012455 has 8 divisors (see below), whose sum is σ = 1577923872. Its totient is φ = 901670688.

The previous prime is 1221012439. The next prime is 1221012461. The reversal of 1221012455 is 5542101221.

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 1221012455 - 2⁴ = 1221012439 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 1221012455.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9392339 + ... + 9392468.

It is an arithmetic number, because the mean of its divisors is an integer number (197240484).

Almost surely, 2^1221012455 is an apocalyptic number.

1221012455 is a deficient number, since it is larger than the sum of its proper divisors (356911417).

1221012455 is a wasteful number, since it uses less digits than its factorization.

1221012455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18784825.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1221012455 is about 34942.9886386382. The cubic root of 1221012455 is about 1068.8252326462.

Adding to 1221012455 its reverse (5542101221), we get a palindrome (6763113676).

The spelling of 1221012455 in words is "one billion, two hundred twenty-one million, twelve thousand, four hundred fifty-five".