1221214546 has 4 divisors (see below), whose sum is σ = 1831821822. Its totient is φ = 610607272.

The previous prime is 1221214537. The next prime is 1221214559. The reversal of 1221214546 is 6454121221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6454121221 = 113 ⋅57116117.

It can be written as a sum of positive squares in only one way, i.e., 1111488921 + 109725625 = 33339^2 + 10475^2 .

It is a super-2 number, since 2×1221214546² = 2982729934723972232, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305303635 + ... + 305303638.

Almost surely, 2^1221214546 is an apocalyptic number.

1221214546 is a deficient number, since it is larger than the sum of its proper divisors (610607276).

1221214546 is an equidigital number, since it uses as much as digits as its factorization.

1221214546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610607275.

The product of its digits is 3840, while the sum is 28.

The square root of 1221214546 is about 34945.8802435995. The cubic root of 1221214546 is about 1068.8841968398.

Adding to 1221214546 its reverse (6454121221), we get a palindrome (7675335767).

The spelling of 1221214546 in words is "one billion, two hundred twenty-one million, two hundred fourteen thousand, five hundred forty-six".