1021004403220 has 48 divisors (see below), whose sum is σ = 2197580566608. Its totient is φ = 398227415040.

The previous prime is 1021004403217. The next prime is 1021004403229. The reversal of 1021004403220 is 223044001201.

1021004403220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 136565724304 + 884438678916 = 369548^2 + 940446^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021004403229) 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, 1203472 + ... + 1868248.

It is an arithmetic number, because the mean of its divisors is an integer number (45782928471).

Almost surely, 2^{1021004403220} is an apocalyptic number.

1021004403220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021004403220 is an abundant number, since it is smaller than the sum of its proper divisors (1176576163388).

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

1021004403220 is a wasteful number, since it uses less digits than its factorization.

1021004403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666700 (or 666698 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 1021004403220 its reverse (223044001201), we get a palindrome (1244048404421).

The spelling of 1021004403220 in words is "one trillion, twenty-one billion, four million, four hundred three thousand, two hundred twenty".