1021002012220 has 12 divisors (see below), whose sum is σ = 2144104225704. Its totient is φ = 408400804880.

The previous prime is 1021002012197. The next prime is 1021002012241. The reversal of 1021002012220 is 222102001201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021002012220.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 25525050286 + ... + 25525050325.

It is an arithmetic number, because the mean of its divisors is an integer number (178675352142).

Almost surely, 2^{1021002012220} is an apocalyptic number.

1021002012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021002012220 is an abundant number, since it is smaller than the sum of its proper divisors (1123102213484).

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

1021002012220 is a wasteful number, since it uses less digits than its factorization.

1021002012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050100620 (or 51050100618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1021002012220 its reverse (222102001201), we get a palindrome (1243104013421).

The spelling of 1021002012220 in words is "one trillion, twenty-one billion, two million, twelve thousand, two hundred twenty".