1211020210 has 8 divisors (see below), whose sum is σ = 2179836396. Its totient is φ = 484408080.

The previous prime is 1211020207. The next prime is 1211020229. The reversal of 1211020210 is 120201121.

It can be written as a sum of positive squares in 2 ways, for example, as 1149413409 + 61606801 = 33903^2 + 7849^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 121102021 = 1211020210 / (1 + 2 + 1 + 1 + 0 + 2 + 0 + 2 + 1 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60551001 + ... + 60551020.

Almost surely, 2^1211020210 is an apocalyptic number.

1211020210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211020210 is a deficient number, since it is larger than the sum of its proper divisors (968816186).

1211020210 is a wasteful number, since it uses less digits than its factorization.

1211020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121102028.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1211020210 is about 34799.7156597579. The cubic root of 1211020210 is about 1065.9016397036.

Adding to 1211020210 its reverse (120201121), we get a palindrome (1331221331).

The spelling of 1211020210 in words is "one billion, two hundred eleven million, twenty thousand, two hundred ten".