1221214421 has 8 divisors (see below), whose sum is σ = 1403385984. Its totient is φ = 1040970960.

The previous prime is 1221214411. The next prime is 1221214451. The reversal of 1221214421 is 1244121221.

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 1221214421 - 2²² = 1217020117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221214393 and 1221214402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221214411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480665 + ... + 483198.

It is an arithmetic number, because the mean of its divisors is an integer number (175423248).

Almost surely, 2^1221214421 is an apocalyptic number.

It is an amenable number.

1221214421 is a deficient number, since it is larger than the sum of its proper divisors (182171563).

1221214421 is an equidigital number, since it uses as much as digits as its factorization.

1221214421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964051.

The product of its digits is 256, while the sum is 20.

The square root of 1221214421 is about 34945.8784551197. The cubic root of 1221214421 is about 1068.8841603705.

Adding to 1221214421 its reverse (1244121221), we get a palindrome (2465335642).

The spelling of 1221214421 in words is "one billion, two hundred twenty-one million, two hundred fourteen thousand, four hundred twenty-one".