1012021101220 has 48 divisors (see below), whose sum is σ = 2128932817200. Its totient is φ = 404106391040.

The previous prime is 1012021101211. The next prime is 1012021101229. The reversal of 1012021101220 is 221011202101.

It is an interprime number because it is at equal distance from previous prime (1012021101211) and next prime (1012021101229).

It can be written as a sum of positive squares in 8 ways, for example, as 396449048164 + 615572053056 = 629642^2 + 784584^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1012021101220.

It is not an unprimeable number, because it can be changed into a prime (1012021101229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33958086 + ... + 33987874.

It is an arithmetic number, because the mean of its divisors is an integer number (44352767025).

Almost surely, 2^{1012021101220} is an apocalyptic number.

1012021101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012021101220 is an abundant number, since it is smaller than the sum of its proper divisors (1116911715980).

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

1012021101220 is a wasteful number, since it uses less digits than its factorization.

1012021101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32688 (or 32686 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1012021101220 its reverse (221011202101), we get a palindrome (1233032303321).

The spelling of 1012021101220 in words is "one trillion, twelve billion, twenty-one million, one hundred one thousand, two hundred twenty".