1221211122010 has 32 divisors (see below), whose sum is σ = 2399451724800. Its totient is φ = 443810631360.

The previous prime is 1221211121989. The next prime is 1221211122049. The reversal of 1221211122010 is 102211121221.

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, 3142330 + ... + 3509509.

It is an arithmetic number, because the mean of its divisors is an integer number (74982866400).

Almost surely, 2^{1221211122010} is an apocalyptic number.

1221211122010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221211122010 is a deficient number, since it is larger than the sum of its proper divisors (1178240602790).

1221211122010 is a wasteful number, since it uses less digits than its factorization.

1221211122010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6653526.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221211122010 its reverse (102211121221), we get a palindrome (1323422243231).

The spelling of 1221211122010 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, ten".