1221213 has 8 divisors (see below), whose sum is σ = 1860928. Its totient is φ = 697824.

The previous prime is 1221197. The next prime is 1221221. The reversal of 1221213 is 3121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221213 - 2⁴ = 1221197 is a prime.

It is a super-2 number, since 2×1221213² = 2982722382738, which contains 22 as substring.

It is a Duffinian number.

1221213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221223) 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, 29056 + ... + 29097.

It is an arithmetic number, because the mean of its divisors is an integer number (232616).

2^1221213 is an apocalyptic number.

It is an amenable number.

1221213 is a deficient number, since it is larger than the sum of its proper divisors (639715).

1221213 is an equidigital number, since it uses as much as digits as its factorization.

1221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58163.

The product of its digits is 24, while the sum is 12.

The square root of 1221213 is about 1105.0850645991. The cubic root of 1221213 is about 106.8883745787. Note that the first 3 decimals are identical.

Adding to 1221213 its reverse (3121221), we get a palindrome (4342434).

The spelling of 1221213 in words is "one million, two hundred twenty-one thousand, two hundred thirteen".