1221021122210 has 16 divisors (see below), whose sum is σ = 2313513705600. Its totient is φ = 462702740976.

The previous prime is 1221021122207. The next prime is 1221021122213. The reversal of 1221021122210 is 122211201221.

It is an interprime number because it is at equal distance from previous prime (1221021122207) and next prime (1221021122213).

It is not an unprimeable number, because it can be changed into a prime (1221021122213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3213213290 + ... + 3213213669.

It is an arithmetic number, because the mean of its divisors is an integer number (144594606600).

Almost surely, 2^{1221021122210} is an apocalyptic number.

1221021122210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021122210 is a deficient number, since it is larger than the sum of its proper divisors (1092492583390).

1221021122210 is a wasteful number, since it uses less digits than its factorization.

1221021122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6426426985.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221021122210 its reverse (122211201221), we get a palindrome (1343232323431).

The spelling of 1221021122210 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, two hundred ten".