1012201221220 has 36 divisors (see below), whose sum is σ = 2472662985660. Its totient is φ = 347040418368.

The previous prime is 1012201221191. The next prime is 1012201221233. The reversal of 1012201221220 is 221221022101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 713595804516 + 298605416704 = 844746^2 + 546448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1012201221194 and 1012201221203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516428215 + ... + 516430174.

It is an arithmetic number, because the mean of its divisors is an integer number (68685082935).

Almost surely, 2^{1012201221220} is an apocalyptic number.

1012201221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012201221220 is an abundant number, since it is smaller than the sum of its proper divisors (1460461764440).

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

1012201221220 is a wasteful number, since it uses less digits than its factorization.

1012201221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032858412 (or 1032858403 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1012201221220 its reverse (221221022101), we get a palindrome (1233422243321).

The spelling of 1012201221220 in words is "one trillion, twelve billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty".