1021206244420 has 12 divisors (see below), whose sum is σ = 2144533113324. Its totient is φ = 408482497760.

The previous prime is 1021206244397. The next prime is 1021206244433. The reversal of 1021206244420 is 244426021201.

It can be written as a sum of positive squares in 2 ways, for example, as 225260347456 + 795945896964 = 474616^2 + 892158^2 .

It is a super-2 number, since 2×1021206244420² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25530156091 + ... + 25530156130.

It is an arithmetic number, because the mean of its divisors is an integer number (178711092777).

Almost surely, 2^{1021206244420} is an apocalyptic number.

1021206244420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021206244420 is an abundant number, since it is smaller than the sum of its proper divisors (1123326868904).

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

1021206244420 is a wasteful number, since it uses less digits than its factorization.

1021206244420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51060312230 (or 51060312228 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The spelling of 1021206244420 in words is "one trillion, twenty-one billion, two hundred six million, two hundred forty-four thousand, four hundred twenty".