1221133210 has 24 divisors (see below), whose sum is σ = 2416029588. Its totient is φ = 444048000.

The previous prime is 1221133159. The next prime is 1221133231. The reversal of 1221133210 is 123311221.

It can be written as a sum of positive squares in 2 ways, for example, as 1141155961 + 79977249 = 33781^2 + 8943^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503391 + ... + 505810.

Almost surely, 2^1221133210 is an apocalyptic number.

1221133210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221133210 is a deficient number, since it is larger than the sum of its proper divisors (1194896378).

1221133210 is a wasteful number, since it uses less digits than its factorization.

1221133210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009230 (or 1009219 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221133210 is about 34944.7164818947. The cubic root of 1221133210 is about 1068.8604661760.

Adding to 1221133210 its reverse (123311221), we get a palindrome (1344444431).

It can be divided in two parts, 1221 and 133210, that added together give a palindrome (134431).

The spelling of 1221133210 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, two hundred ten".