1221412210 has 16 divisors (see below), whose sum is σ = 2199427992. Its totient is φ = 488368000.

The previous prime is 1221412201. The next prime is 1221412229. The reversal of 1221412210 is 122141221.

It can be written as a sum of positive squares in 4 ways, for example, as 927872521 + 293539689 = 30461^2 + 17133^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2910 + ... + 49510.

Almost surely, 2^1221412210 is an apocalyptic number.

1221412210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221412210 is a deficient number, since it is larger than the sum of its proper divisors (978015782).

1221412210 is a wasteful number, since it uses less digits than its factorization.

1221412210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49229.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221412210 is about 34948.7082736973. The cubic root of 1221412210 is about 1068.9418630728.

Adding to 1221412210 its reverse (122141221), we get a palindrome (1343553431).

The spelling of 1221412210 in words is "one billion, two hundred twenty-one million, four hundred twelve thousand, two hundred ten".