1221154454 has 12 divisors (see below), whose sum is σ = 1983473316. Its totient is φ = 563609592.

The previous prime is 1221154409. The next prime is 1221154483. The reversal of 1221154454 is 4544511221.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1806104 + ... + 1806779.

It is an arithmetic number, because the mean of its divisors is an integer number (165289443).

Almost surely, 2^1221154454 is an apocalyptic number.

1221154454 is a deficient number, since it is larger than the sum of its proper divisors (762318862).

1221154454 is a wasteful number, since it uses less digits than its factorization.

1221154454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612911 (or 3612898 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 1221154454 is about 34945.0204464098. The cubic root of 1221154454 is about 1068.8666644461.

Adding to 1221154454 its reverse (4544511221), we get a palindrome (5765665675).

The spelling of 1221154454 in words is "one billion, two hundred twenty-one million, one hundred fifty-four thousand, four hundred fifty-four".