1221454042 has 16 divisors (see below), whose sum is σ = 1877904000. Its totient is φ = 595502560.

The previous prime is 1221454009. The next prime is 1221454081. The reversal of 1221454042 is 2404541221.

It is a junction number, because it is equal to n+sod(n) for n = 1221453998 and 1221454016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218559 + ... + 224077.

It is an arithmetic number, because the mean of its divisors is an integer number (117369000).

Almost surely, 2^1221454042 is an apocalyptic number.

1221454042 is a deficient number, since it is larger than the sum of its proper divisors (656449958).

1221454042 is a wasteful number, since it uses less digits than its factorization.

1221454042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8261.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 1221454042 is about 34949.3067456280. The cubic root of 1221454042 is about 1068.9540662873.

Adding to 1221454042 its reverse (2404541221), we get a palindrome (3625995263).

The spelling of 1221454042 in words is "one billion, two hundred twenty-one million, four hundred fifty-four thousand, forty-two".