1221020140305 has 16 divisors (see below), whose sum is σ = 2232722542464. Its totient is φ = 558180635520.

The previous prime is 1221020140259. The next prime is 1221020140337. The reversal of 1221020140305 is 5030410201221.

It is not a de Polignac number, because 1221020140305 - 2¹⁵ = 1221020107537 is a prime.

It is a super-3 number, since 3×1221020140305³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 15 ways as a sum of consecutive naturals, for example, 5814381516 + ... + 5814381725.

It is an arithmetic number, because the mean of its divisors is an integer number (139545158904).

Almost surely, 2^{1221020140305} is an apocalyptic number.

1221020140305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221020140305 is a deficient number, since it is larger than the sum of its proper divisors (1011702402159).

1221020140305 is a wasteful number, since it uses less digits than its factorization.

1221020140305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11628763256.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 1221020140305 its reverse (5030410201221), we get a palindrome (6251430341526).

The spelling of 1221020140305 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred forty thousand, three hundred five".