1213011305220 has 144 divisors (see below), whose sum is σ = 4020442614720. Its totient is φ = 271443068160.

The previous prime is 1213011305201. The next prime is 1213011305239. The reversal of 1213011305220 is 225031103121.

It is an interprime number because it is at equal distance from previous prime (1213011305201) and next prime (1213011305239).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6331830 + ... + 6520589.

It is an arithmetic number, because the mean of its divisors is an integer number (27919740380).

Almost surely, 2^{1213011305220} is an apocalyptic number.

1213011305220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213011305220 is an abundant number, since it is smaller than the sum of its proper divisors (2807431309500).

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

1213011305220 is a wasteful number, since it uses less digits than its factorization.

1213011305220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12852466 (or 12852453 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 1213011305220 its reverse (225031103121), we get a palindrome (1438042408341).

The spelling of 1213011305220 in words is "one trillion, two hundred thirteen billion, eleven million, three hundred five thousand, two hundred twenty".