1221022220210 has 32 divisors (see below), whose sum is σ = 2448522019440. Its totient is φ = 435292800768.

The previous prime is 1221022220161. The next prime is 1221022220261. The reversal of 1221022220210 is 120222201221.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 194628321889 + 1026393898321 = 441167^2 + 1013111^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161935517 + ... + 161943056.

Almost surely, 2^{1221022220210} is an apocalyptic number.

1221022220210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221022220210 is an abundant number, since it is smaller than the sum of its proper divisors (1227499799230).

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

1221022220210 is a wasteful number, since it uses less digits than its factorization.

1221022220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323878622.

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

Adding to 1221022220210 its reverse (120222201221), we get a palindrome (1341244421431).

The spelling of 1221022220210 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred ten".