1221433213 has 32 divisors (see below), whose sum is σ = 1648023552. Its totient is φ = 874238400.

The previous prime is 1221433207. The next prime is 1221433219. The reversal of 1221433213 is 3123341221.

It is an interprime number because it is at equal distance from previous prime (1221433207) and next prime (1221433219).

It is not a de Polignac number, because 1221433213 - 2²¹ = 1219336061 is a prime.

It is a super-3 number, since 3×1221433213³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221433219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208320 + ... + 214102.

It is an arithmetic number, because the mean of its divisors is an integer number (51500736).

Almost surely, 2^1221433213 is an apocalyptic number.

1221433213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221433213 is a deficient number, since it is larger than the sum of its proper divisors (426590339).

1221433213 is a wasteful number, since it uses less digits than its factorization.

1221433213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025.

The product of its digits is 864, while the sum is 22.

The square root of 1221433213 is about 34949.0087556142. The cubic root of 1221433213 is about 1068.9479900945.

Adding to 1221433213 its reverse (3123341221), we get a palindrome (4344774434).

It can be divided in two parts, 1221 and 433213, that added together give a palindrome (434434).

The spelling of 1221433213 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, two hundred thirteen".