1221110210 has 8 divisors (see below), whose sum is σ = 2197998396. Its totient is φ = 488444080.

The previous prime is 1221110161. The next prime is 1221110237. The reversal of 1221110210 is 120111221.

It can be written as a sum of positive squares in 2 ways, for example, as 1040127001 + 180983209 = 32251^2 + 13453^2 .

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

It is a super-2 number, since 2×1221110210² = 2982220289932488200, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221110191 and 1221110200.

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, 61055501 + ... + 61055520.

Almost surely, 2^1221110210 is an apocalyptic number.

1221110210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221110210 is a deficient number, since it is larger than the sum of its proper divisors (976888186).

1221110210 is a wasteful number, since it uses less digits than its factorization.

1221110210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122111028.

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

The square root of 1221110210 is about 34944.3873891073. The cubic root of 1221110210 is about 1068.8537554845.

Adding to 1221110210 its reverse (120111221), we get a palindrome (1341221431).

The spelling of 1221110210 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, two hundred ten".