1021222120020 has 96 divisors (see below), whose sum is σ = 2994364074240. Its totient is φ = 259558548480.

The previous prime is 1021222120007. The next prime is 1021222120031. The reversal of 1021222120020 is 200212221201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 928975 + ... + 1704534.

It is an arithmetic number, because the mean of its divisors is an integer number (31191292440).

Almost surely, 2^{1021222120020} is an apocalyptic number.

1021222120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021222120020 is an abundant number, since it is smaller than the sum of its proper divisors (1973141954220).

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

1021222120020 is a wasteful number, since it uses less digits than its factorization.

1021222120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633825 (or 2633823 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1021222120020 its reverse (200212221201), we get a palindrome (1221434341221).

The spelling of 1021222120020 in words is "one trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, twenty".