1221222020210 has 16 divisors (see below), whose sum is σ = 2228311961496. Its totient is φ = 481797180288.

The previous prime is 1221222020203. The next prime is 1221222020251. The reversal of 1221222020210 is 120202221221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1159763147929 + 61458872281 = 1076923^2 + 247909^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 836452709 + ... + 836454168.

Almost surely, 2^{1221222020210} is an apocalyptic number.

1221222020210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221222020210 is a deficient number, since it is larger than the sum of its proper divisors (1007089941286).

1221222020210 is a wasteful number, since it uses less digits than its factorization.

1221222020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672906957.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221222020210 its reverse (120202221221), we get a palindrome (1341424241431).

The spelling of 1221222020210 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, two hundred ten".