1021101212220 has 48 divisors (see below), whose sum is σ = 2936355924768. Its totient is φ = 264934368000.

The previous prime is 1021101212191. The next prime is 1021101212227. The reversal of 1021101212220 is 222121011201.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1021101212220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021101212227) 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 15 ways as a sum of consecutive naturals, for example, 229975531 + ... + 229979970.

It is an arithmetic number, because the mean of its divisors is an integer number (61174081766).

Almost surely, 2^{1021101212220} is an apocalyptic number.

1021101212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021101212220 is an abundant number, since it is smaller than the sum of its proper divisors (1915254712548).

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

1021101212220 is a wasteful number, since it uses less digits than its factorization.

1021101212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459955550 (or 459955548 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021101212220 its reverse (222121011201), we get a palindrome (1243222223421).

It can be divided in two parts, 1021101 and 212220, that added together give a palindrome (1233321).

The spelling of 1021101212220 in words is "one trillion, twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred twenty".