1221854416 has 20 divisors (see below), whose sum is σ = 2368668832. Its totient is φ = 610585056.

The previous prime is 1221854383. The next prime is 1221854453. The reversal of 1221854416 is 6144581221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9421 + ... + 50323.

Almost surely, 2^1221854416 is an apocalyptic number.

1221854416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221854416 is a deficient number, since it is larger than the sum of its proper divisors (1146814416).

1221854416 is a wasteful number, since it uses less digits than its factorization.

1221854416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42778 (or 42772 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 1221854416 is about 34955.0342010990. The cubic root of 1221854416 is about 1069.0708491399.

The spelling of 1221854416 in words is "one billion, two hundred twenty-one million, eight hundred fifty-four thousand, four hundred sixteen".