1021221220212 has 24 divisors (see below), whose sum is σ = 2647610571200. Its totient is φ = 340407073368.

The previous prime is 1021221220207. The next prime is 1021221220213. The reversal of 1021221220212 is 2120221221201.

It is a happy number.

1021221220212 is a `hidden beast` number, since 1 + 0 + 212 + 21 + 220 + 212 = 666.

It is a super-2 number, since 2×1021221220212² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221220213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4727875912 + ... + 4727876127.

Almost surely, 2^{1021221220212} is an apocalyptic number.

1021221220212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021221220212 is an abundant number, since it is smaller than the sum of its proper divisors (1626389350988).

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

1021221220212 is a wasteful number, since it uses less digits than its factorization.

1021221220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9455752052 (or 9455752044 counting only the distinct ones).

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

Adding to 1021221220212 its reverse (2120221221201), we get a palindrome (3141442441413).

The spelling of 1021221220212 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".