1221011210 has 8 divisors (see below), whose sum is σ = 2197820196. Its totient is φ = 488404480.

The previous prime is 1221011177. The next prime is 1221011221. The reversal of 1221011210 is 121101221.

It can be written as a sum of positive squares in 2 ways, for example, as 1114157641 + 106853569 = 33379^2 + 10337^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1221011191 and 1221011200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61050551 + ... + 61050570.

Almost surely, 2^1221011210 is an apocalyptic number.

1221011210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011210 is a deficient number, since it is larger than the sum of its proper divisors (976808986).

1221011210 is a wasteful number, since it uses less digits than its factorization.

1221011210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122101128.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1221011210 is about 34942.9708239010. The cubic root of 1221011210 is about 1068.8248693717.

Adding to 1221011210 its reverse (121101221), we get a palindrome (1342112431).

It can be divided in two parts, 1221011 and 210, that added together give a palindrome (1221221).

The spelling of 1221011210 in words is "one billion, two hundred twenty-one million, eleven thousand, two hundred ten".