1221020011010 has 64 divisors (see below), whose sum is σ = 2355827628672. Its totient is φ = 454010735616.

The previous prime is 1221020011009. The next prime is 1221020011091. The reversal of 1221020011010 is 101100201221.

It is a junction number, because it is equal to n+sod(n) for n = 1221020010982 and 1221020011000.

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 31 ways as a sum of consecutive naturals, for example, 59999657 + ... + 60020003.

It is an arithmetic number, because the mean of its divisors is an integer number (36809806698).

Almost surely, 2^{1221020011010} is an apocalyptic number.

1221020011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221020011010 is a deficient number, since it is larger than the sum of its proper divisors (1134807617662).

1221020011010 is a wasteful number, since it uses less digits than its factorization.

1221020011010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24707.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221020011010 its reverse (101100201221), we get a palindrome (1322120212231).

The spelling of 1221020011010 in words is "one trillion, two hundred twenty-one billion, twenty million, eleven thousand, ten".