1212421210 has 180 divisors, whose sum is σ = 3023842590. Its totient is φ = 348828480.

The previous prime is 1212421201. The next prime is 1212421211. The reversal of 1212421210 is 121242121.

It can be written as a sum of positive squares in 3 ways, for example, as 522991161 + 689430049 = 22869^2 + 26257^2 .

It is not an unprimeable number, because it can be changed into a prime (1212421211) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 93263164 + ... + 93263176.

Almost surely, 2^1212421210 is an apocalyptic number.

1212421210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212421210 is an abundant number, since it is smaller than the sum of its proper divisors (1811421380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212421210 is an equidigital number, since it uses as much as digits as its factorization.

1212421210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 38 counting only the distinct ones).

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

The square root of 1212421210 is about 34819.8393161140. The cubic root of 1212421210 is about 1066.3125199101.

Adding to 1212421210 its reverse (121242121), we get a palindrome (1333663331).

Subtracting from 1212421210 its reverse (121242121), we obtain a square (1091179089 = 33033²).

The spelling of 1212421210 in words is "one billion, two hundred twelve million, four hundred twenty-one thousand, two hundred ten".