1221021112010 has 64 divisors (see below), whose sum is σ = 2530162096128. Its totient is φ = 415588593984.

The previous prime is 1221021111979. The next prime is 1221021112013. The reversal of 1221021112010 is 102111201221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (1221021112013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5403107 + ... + 5624553.

It is an arithmetic number, because the mean of its divisors is an integer number (39533782752).

Almost surely, 2^{1221021112010} is an apocalyptic number.

1221021112010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021112010 is an abundant number, since it is smaller than the sum of its proper divisors (1309140984118).

1221021112010 is a wasteful number, since it uses less digits than its factorization.

1221021112010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222035.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221021112010 its reverse (102111201221), we get a palindrome (1323132313231).

It can be divided in two parts, 12210211 and 12010, that added together give a palindrome (12222221).

The spelling of 1221021112010 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, ten".