1012212221220 has 72 divisors (see below), whose sum is σ = 3153360255864. Its totient is φ = 262628034048.

The previous prime is 1012212221191. The next prime is 1012212221221. The reversal of 1012212221220 is 221222122101.

It is a happy number.

1012212221220 is a `hidden beast` number, since 1 + 0 + 1 + 221 + 2 + 221 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 149286413376 + 862925807844 = 386376^2 + 928938^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1012212221193 and 1012212221202.

It is not an unprimeable number, because it can be changed into a prime (1012212221221) 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 23 ways as a sum of consecutive naturals, for example, 75985249 + ... + 75998568.

Almost surely, 2^{1012212221220} is an apocalyptic number.

1012212221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012212221220 is an abundant number, since it is smaller than the sum of its proper divisors (2141148034644).

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

1012212221220 is a wasteful number, since it uses less digits than its factorization.

1012212221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151983869 (or 151983864 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1012212221220 its reverse (221222122101), we get a palindrome (1233434343321).

The spelling of 1012212221220 in words is "one trillion, twelve billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty".